A new method of geogas (soil gas) collection and analysis, is briefly introduced. A geogas collector is buried at shallow depth to collect volatile compounds for a period of 60-90 days. The adsorbed compounds are anal...A new method of geogas (soil gas) collection and analysis, is briefly introduced. A geogas collector is buried at shallow depth to collect volatile compounds for a period of 60-90 days. The adsorbed compounds are analyzed by INAA. This paper presents the multi-elemental anomaly of a gold deposit, Southwest China.The element contents and the multielemental anomaly of geogas were compared with those in the near- surface soil around the collector, background of the collector, and in gold ores. The geogas anomaly on gold deposit is demonstrated as a direct indicator of subsurface deposits.展开更多
Reported in this paper are:1)the law of element abundance relationships:element abun-dances are of power function with each other in an igneous rock petrogenetically associated with fractional crystallization,2)deduct...Reported in this paper are:1)the law of element abundance relationships:element abun-dances are of power function with each other in an igneous rock petrogenetically associated with fractional crystallization,2)deduction of the law and relevant parameters:abundance relationship constant(a°) and phase constant? from Henry's law and the law of mass conservation,3)the data basis and evidence of the law of element abundance relationships,4)establishment of the equa-bions for element abundance relationships in igneous rocks formed from the same parental magma during the same fractional crystallization stage ,and all measurable parameters involved in the equations.展开更多
Three major volcanic rock sequences in the P2β formation(Emeishan basalts)were sampled dur-ing a comprehensive study of the Late Permian volcanics associated with the Panxi paleorift in southwestern China .Two of the...Three major volcanic rock sequences in the P2β formation(Emeishan basalts)were sampled dur-ing a comprehensive study of the Late Permian volcanics associated with the Panxi paleorift in southwestern China .Two of the three sections-Emei and Tangfang are composed of continental flood basalts(CFB) while the third-Ertan is an alkalic center.Multi-element chemical analyses indi-cate a predominance of low MgO transitional quartz tholeiites at Emei and Tangfang,whereas the Ertan suite ranges from high-MgO alkaline olivine basalts to rhombic porphyry trachytes and quartz-bearing aegerine-augite syenites.Consanguineity of the rocks from the three sections is sug-gested by consistently high TiO2 ,K2O,incompatible trace elements and uniformly fractionated REE patterns typical of alkalic compositions,but antypical of CFB.Sr isotope data for ten Emei basalt samples(^87Sr/^86Sr=0.7066-0.7082)which show no correla-tion with Rb/Sr ratios (0.02-0.12) and Nd isotopes for two of the samples(^143Nd/^144Nd=0.51171-0.51174)are interpreted as being related to the mantle evolution.The primary magmas re-sponsible for all the three sequences have been modeled in terms of a uniformly metasomatized man-tle source.Trace element models support the derivation of the Emei and Tangfang primary magmas from 10-15 percent partial melting of spinel lherzolite,followed by fractional crystallization of olivive and clinopyroxene.The primary alkaline olivine basalts at Ertan are generated by 7-10 percent par-tial melting of a chemically equivalent source in the garnet-peridodite stability region.The assumed mantle composition is characterixzed by Rb=3.8-5.5 ppm,Sr=62-83ppm,Ba=45-64 ppm,La=3.8-5.6ppm,and Yb=0.46-0.57ppm.The proposed mechanism of regional mantle enrichment requires metasomatic stabilization of phlogopite which becomes depleted later during par-tial melting.Such enrichment is consistent with the models proposed for alkalic systems in which a large mantle diaper acts as the agent for upward enrichment as well as uplift and extension of the crust.展开更多
The carat is the unit of weight for diamonds and other gemstones.It corresponds to the average weight of the seeds of a leguminous tree.What kind of tree is this?We have studied the samples from Ethiopia,Egypt,Cyprus ...The carat is the unit of weight for diamonds and other gemstones.It corresponds to the average weight of the seeds of a leguminous tree.What kind of tree is this?We have studied the samples from Ethiopia,Egypt,Cyprus and the United States.The tree is neither'Kuara'nor'Locust'（Robina pseudoacacia Linn.）,but rather Carob(Ceratonia Siliqua).In Ethiopia,as called by local inhabitants,'Kuara'is a species of Erythrina-E.brucei rather than E.abyssinica.As might be expected,using the seeds as a means of weighing an extremely valuable commodity is not very scientific.Before 1907,at various times and in various countries,there were at least twenty-three stan-dards for the carat ranging from 187.00mg to 215.990mg.The metric carat equal to 200mg was proposed in Paris in 1907.It was adopted in the United States on July1,1913 and now is the world-accepted standard.But in reality,the standard of the carat is still confused with respect to its usage throughout the world .This is why the author reiterates that the standard of the car-at should be integrated with the metric system.展开更多
This paper deais with the geological conditions.mineralization characteristics,genetic types and space-time distribution of the Devonian-Carboniferous strata-bound carbonate-type uranium deposits in South China.These ...This paper deais with the geological conditions.mineralization characteristics,genetic types and space-time distribution of the Devonian-Carboniferous strata-bound carbonate-type uranium deposits in South China.These ore deposits are genetically classified as the leaching type and the leaching-hydrothermal superimposed type,These ore deposits are confined mainly to the strata (D2-3,C1)of platform-lagoon carbonate facies.Unique tectonic settings are a vital factor leading to the formation of these uranium deposits.A metallogenetic model for these uranium deposits has been proposed.展开更多
Based on the data of 64 samples ,the REE geochemical characteristics of volcanic rocks in northern Zhejiang and eastern Jiangxi provinces are discussed in this paper.The REE distribution patterns in acid and intermedi...Based on the data of 64 samples ,the REE geochemical characteristics of volcanic rocks in northern Zhejiang and eastern Jiangxi provinces are discussed in this paper.The REE distribution patterns in acid and intermediate-acid volcanic rocks in these areas display some similarities,as indicated by rightward-inclined V-shaped curves with negative Eu anomalies,which are parallel to earch other.In addi-tion,their REE parameters(ΣREE,ΣLREE/ΣHREE,δEu,Ce/Yb,La/Sm,La/Yb,etc)also va-ry over a narrow range with small deviations.HREE are particularly concentrated in the volcanic rocks as-sociated with uranium mineralization.The initial ^87Sr/^86Sr ratio in the volcanic rocks is about 0.7056-0.7139.All these features in conjunction with strontium isotopic data indicate that the rock-forming materials come from the sialic crust.The REE distribution patterns and REE geochemical parameters of the volcanic rocks ,as well as La/Sm-La and Ce/Yb-Eu/Yb diagrams may be applied to the sources of rock-forming and ore-forming materials.展开更多
In recent years, a lot of writers have used Cagniard-de Hoop's method[1][] to solve some problems of elastic wave. But it is a difficult and complicated task to change the path of integration when we use this meth...In recent years, a lot of writers have used Cagniard-de Hoop's method[1][] to solve some problems of elastic wave. But it is a difficult and complicated task to change the path of integration when we use this method. A differential transform by A.Ungar[3,6] can obviate this difficulty. In this paper, weuse Ungar 's differential transform to solve a case of Lamb's problem [1][2]展开更多
The Huangsha Ag-rich tungsten deposit is genetically related to a buried granite which shows apparent vertical zoning in alteration.Greisen-type W(Mo) ores coccur at the top or the intrusive and sulfide-wolframite-qua...The Huangsha Ag-rich tungsten deposit is genetically related to a buried granite which shows apparent vertical zoning in alteration.Greisen-type W(Mo) ores coccur at the top or the intrusive and sulfide-wolframite-quartz veins developed at the major stage of mineralization are present in low-grade metamorphic rocks in the outer-contacts.The veins exhibit a reversed zonation in the vertical section with silver concentrated in the lower part in association with sulfides.Micas,characterized by high Si and low Al.are extensively developed both in the granite and in the veins.They have similar cell parameters.belonging to 2M1 type,but those in the veins are understanding of the petrogenesis, evolution and mineralization of the granite.展开更多
A new method is proposed to prospect copper deposits with portable XRF analyzer. The method is based on the close relation between Cu and the chalcophile elements or some other elements in the geochemical anomalies of...A new method is proposed to prospect copper deposits with portable XRF analyzer. The method is based on the close relation between Cu and the chalcophile elements or some other elements in the geochemical anomalies of a Cu deposit. Applications of the technique in Northeast China are presented.展开更多
Sulfantimonide is a common mineral. Selenide of stibium is only a synthetic mineral at present. However, selenio-sulfantimonide has not been reported in literature. So it is the
Based on the characteristics of stratigraphy sedimentary system and paleotectonics, Xizang (Tibet) Tethys can be classified into nine sedimentary basins. The sedimentary and development characteristics of each basin n...Based on the characteristics of stratigraphy sedimentary system and paleotectonics, Xizang (Tibet) Tethys can be classified into nine sedimentary basins. The sedimentary and development characteristics of each basin nicely reveal the plate tectonic framework of Xizang (Tibet). The studies show that the Bangong Lake-Dengen fracture zone is intraplate transform boundary, the active continental margin of the Yarlung Zangbo River is of the nature of "range-arc" boundary, not trench-arc-back-arc basin system.展开更多
All the methods in literature for extraction of thermodynamic properties of minerals from reversed experiment (REP) data neither completely meet the requirements of thermodynamics nor fully reflect the thermodynamic f...All the methods in literature for extraction of thermodynamic properties of minerals from reversed experiment (REP) data neither completely meet the requirements of thermodynamics nor fully reflect the thermodynamic features of REP data. So there have been disputes about the thermodynamic validity of the methods. A method called interval-halving-scanning-展开更多
Schistosity is a kind of commonly-found foliation structure, characteristic of and widely distributed over tbe regional metamorphic rock series. Geologists have long paid attention to it and held different opinions on...Schistosity is a kind of commonly-found foliation structure, characteristic of and widely distributed over tbe regional metamorphic rock series. Geologists have long paid attention to it and held different opinions on bedding schistosity. Some suggest the schistosity formed parallel to the bedding surface be called bedding schistosity. Others insist that bedding schistosity is a kind of axial plane schistosity on the flanks of folds. We have studied the schistosity of the metamorphic rock series in展开更多
Sicklerite is a secondary lithium phosphate mineral, a weathered product of the lithiophilite-triphilite series occurring in Li-rich pegmatite. Sicklerite was first found by Schall in 1912 in a pegmatite mine of Calif...Sicklerite is a secondary lithium phosphate mineral, a weathered product of the lithiophilite-triphilite series occurring in Li-rich pegmatite. Sicklerite was first found by Schall in 1912 in a pegmatite mine of California, U.S.A., and subsequently discovered in the Li-pegmatite of Sweden, U.S.S.R., France, Morocco, etc., so far no report of it has yet been made in China.展开更多
Many methods have been published in literature for automatical plotting of a stable equilibrium p-T diagram of an n-component system composed of n+2 phases. However, these methods are complicated, or allowable only fo...Many methods have been published in literature for automatical plotting of a stable equilibrium p-T diagram of an n-component system composed of n+2 phases. However, these methods are complicated, or allowable only for qualitative applications, or not universal.展开更多
In 1980, we found a metallic mineral in a Cu-Ni deposit in Xinjiang. After X-ray powder study and microprobe analysis, it proved to be a Ni-bearing new variety of djerfisherite. Until now no report of it has been made...In 1980, we found a metallic mineral in a Cu-Ni deposit in Xinjiang. After X-ray powder study and microprobe analysis, it proved to be a Ni-bearing new variety of djerfisherite. Until now no report of it has been made in China. The Ni-djerfisherite has metallic lustre, size O.01—0.1mm in diameter, associated with pyrite, pentlandite,chalcopyrite and pyrrhotine, etc. The Ni-djerfisherite is concentrated in pyrrhotine, and is probably a product of pyrrhotine solid-solution decomposition.展开更多
Triplite （Mn, Fe, Mg, Ca）2 FPO4 is a kind of rare phosphate often occurring in pegmatite. Mineralogical and structural study as well as measurements of M（?）ssbauer spectra on triplite and related minerals have bee...Triplite （Mn, Fe, Mg, Ca）2 FPO4 is a kind of rare phosphate often occurring in pegmatite. Mineralogical and structural study as well as measurements of M（?）ssbauer spectra on triplite and related minerals have been made. Kostiner et al. showed that the M（?）ssbauer spectrum of triplite at room temperature consists of two展开更多
M(?)ssbauer effect has been widely applied to mineralogy. It is mainly used to determine iron valence, coordination number and Fe-Mg order-disorder. In addition, some useful information on multiple-phase meteorite and...M(?)ssbauer effect has been widely applied to mineralogy. It is mainly used to determine iron valence, coordination number and Fe-Mg order-disorder. In addition, some useful information on multiple-phase meteorite and rock can be given. In re-展开更多
Based on the results of research work and practices of the author, three kinds of methods and techniques for determining the fold shapes in the metamorphic rock region are advanced: (ⅰ) the microschist method, (ⅱ) t...Based on the results of research work and practices of the author, three kinds of methods and techniques for determining the fold shapes in the metamorphic rock region are advanced: (ⅰ) the microschist method, (ⅱ) the hook fold method and (ⅲ) the structural lenticular method. The theoretical foundation of these methods is structural transposition. The methods and techniques are successful both in practical and theoretical senses. We have gained fairly good effects by utilizing these methods.展开更多
Tungsten in southeastern China is well-known to the world. Studies of tungsten ore have been reported for many decades, but silver in the ore has never been noted. In this paper description of a new variety of Ag-bear...Tungsten in southeastern China is well-known to the world. Studies of tungsten ore have been reported for many decades, but silver in the ore has never been noted. In this paper description of a new variety of Ag-bearing mineral discovered in the Huangsha tungsten ore deposit is given.展开更多
基金The Project Supported by Foundation for Development of Geological Sciences and Techniques of China
文摘A new method of geogas (soil gas) collection and analysis, is briefly introduced. A geogas collector is buried at shallow depth to collect volatile compounds for a period of 60-90 days. The adsorbed compounds are analyzed by INAA. This paper presents the multi-elemental anomaly of a gold deposit, Southwest China.The element contents and the multielemental anomaly of geogas were compared with those in the near- surface soil around the collector, background of the collector, and in gold ores. The geogas anomaly on gold deposit is demonstrated as a direct indicator of subsurface deposits.
文摘Reported in this paper are:1)the law of element abundance relationships:element abun-dances are of power function with each other in an igneous rock petrogenetically associated with fractional crystallization,2)deduction of the law and relevant parameters:abundance relationship constant(a°) and phase constant? from Henry's law and the law of mass conservation,3)the data basis and evidence of the law of element abundance relationships,4)establishment of the equa-bions for element abundance relationships in igneous rocks formed from the same parental magma during the same fractional crystallization stage ,and all measurable parameters involved in the equations.
文摘Three major volcanic rock sequences in the P2β formation(Emeishan basalts)were sampled dur-ing a comprehensive study of the Late Permian volcanics associated with the Panxi paleorift in southwestern China .Two of the three sections-Emei and Tangfang are composed of continental flood basalts(CFB) while the third-Ertan is an alkalic center.Multi-element chemical analyses indi-cate a predominance of low MgO transitional quartz tholeiites at Emei and Tangfang,whereas the Ertan suite ranges from high-MgO alkaline olivine basalts to rhombic porphyry trachytes and quartz-bearing aegerine-augite syenites.Consanguineity of the rocks from the three sections is sug-gested by consistently high TiO2 ,K2O,incompatible trace elements and uniformly fractionated REE patterns typical of alkalic compositions,but antypical of CFB.Sr isotope data for ten Emei basalt samples(^87Sr/^86Sr=0.7066-0.7082)which show no correla-tion with Rb/Sr ratios (0.02-0.12) and Nd isotopes for two of the samples(^143Nd/^144Nd=0.51171-0.51174)are interpreted as being related to the mantle evolution.The primary magmas re-sponsible for all the three sequences have been modeled in terms of a uniformly metasomatized man-tle source.Trace element models support the derivation of the Emei and Tangfang primary magmas from 10-15 percent partial melting of spinel lherzolite,followed by fractional crystallization of olivive and clinopyroxene.The primary alkaline olivine basalts at Ertan are generated by 7-10 percent par-tial melting of a chemically equivalent source in the garnet-peridodite stability region.The assumed mantle composition is characterixzed by Rb=3.8-5.5 ppm,Sr=62-83ppm,Ba=45-64 ppm,La=3.8-5.6ppm,and Yb=0.46-0.57ppm.The proposed mechanism of regional mantle enrichment requires metasomatic stabilization of phlogopite which becomes depleted later during par-tial melting.Such enrichment is consistent with the models proposed for alkalic systems in which a large mantle diaper acts as the agent for upward enrichment as well as uplift and extension of the crust.
文摘The carat is the unit of weight for diamonds and other gemstones.It corresponds to the average weight of the seeds of a leguminous tree.What kind of tree is this?We have studied the samples from Ethiopia,Egypt,Cyprus and the United States.The tree is neither'Kuara'nor'Locust'（Robina pseudoacacia Linn.）,but rather Carob(Ceratonia Siliqua).In Ethiopia,as called by local inhabitants,'Kuara'is a species of Erythrina-E.brucei rather than E.abyssinica.As might be expected,using the seeds as a means of weighing an extremely valuable commodity is not very scientific.Before 1907,at various times and in various countries,there were at least twenty-three stan-dards for the carat ranging from 187.00mg to 215.990mg.The metric carat equal to 200mg was proposed in Paris in 1907.It was adopted in the United States on July1,1913 and now is the world-accepted standard.But in reality,the standard of the carat is still confused with respect to its usage throughout the world .This is why the author reiterates that the standard of the car-at should be integrated with the metric system.
文摘This paper deais with the geological conditions.mineralization characteristics,genetic types and space-time distribution of the Devonian-Carboniferous strata-bound carbonate-type uranium deposits in South China.These ore deposits are genetically classified as the leaching type and the leaching-hydrothermal superimposed type,These ore deposits are confined mainly to the strata (D2-3,C1)of platform-lagoon carbonate facies.Unique tectonic settings are a vital factor leading to the formation of these uranium deposits.A metallogenetic model for these uranium deposits has been proposed.
文摘Based on the data of 64 samples ,the REE geochemical characteristics of volcanic rocks in northern Zhejiang and eastern Jiangxi provinces are discussed in this paper.The REE distribution patterns in acid and intermediate-acid volcanic rocks in these areas display some similarities,as indicated by rightward-inclined V-shaped curves with negative Eu anomalies,which are parallel to earch other.In addi-tion,their REE parameters(ΣREE,ΣLREE/ΣHREE,δEu,Ce/Yb,La/Sm,La/Yb,etc)also va-ry over a narrow range with small deviations.HREE are particularly concentrated in the volcanic rocks as-sociated with uranium mineralization.The initial ^87Sr/^86Sr ratio in the volcanic rocks is about 0.7056-0.7139.All these features in conjunction with strontium isotopic data indicate that the rock-forming materials come from the sialic crust.The REE distribution patterns and REE geochemical parameters of the volcanic rocks ,as well as La/Sm-La and Ce/Yb-Eu/Yb diagrams may be applied to the sources of rock-forming and ore-forming materials.
文摘In recent years, a lot of writers have used Cagniard-de Hoop's method[1][] to solve some problems of elastic wave. But it is a difficult and complicated task to change the path of integration when we use this method. A differential transform by A.Ungar[3,6] can obviate this difficulty. In this paper, weuse Ungar 's differential transform to solve a case of Lamb's problem [1][2]
文摘The Huangsha Ag-rich tungsten deposit is genetically related to a buried granite which shows apparent vertical zoning in alteration.Greisen-type W(Mo) ores coccur at the top or the intrusive and sulfide-wolframite-quartz veins developed at the major stage of mineralization are present in low-grade metamorphic rocks in the outer-contacts.The veins exhibit a reversed zonation in the vertical section with silver concentrated in the lower part in association with sulfides.Micas,characterized by high Si and low Al.are extensively developed both in the granite and in the veins.They have similar cell parameters.belonging to 2M1 type,but those in the veins are understanding of the petrogenesis, evolution and mineralization of the granite.
文摘A new method is proposed to prospect copper deposits with portable XRF analyzer. The method is based on the close relation between Cu and the chalcophile elements or some other elements in the geochemical anomalies of a Cu deposit. Applications of the technique in Northeast China are presented.
文摘Sulfantimonide is a common mineral. Selenide of stibium is only a synthetic mineral at present. However, selenio-sulfantimonide has not been reported in literature. So it is the
文摘Based on the characteristics of stratigraphy sedimentary system and paleotectonics, Xizang (Tibet) Tethys can be classified into nine sedimentary basins. The sedimentary and development characteristics of each basin nicely reveal the plate tectonic framework of Xizang (Tibet). The studies show that the Bangong Lake-Dengen fracture zone is intraplate transform boundary, the active continental margin of the Yarlung Zangbo River is of the nature of "range-arc" boundary, not trench-arc-back-arc basin system.
基金Project supported by the National Natural Science Foundation of China.
文摘All the methods in literature for extraction of thermodynamic properties of minerals from reversed experiment (REP) data neither completely meet the requirements of thermodynamics nor fully reflect the thermodynamic features of REP data. So there have been disputes about the thermodynamic validity of the methods. A method called interval-halving-scanning-
文摘Schistosity is a kind of commonly-found foliation structure, characteristic of and widely distributed over tbe regional metamorphic rock series. Geologists have long paid attention to it and held different opinions on bedding schistosity. Some suggest the schistosity formed parallel to the bedding surface be called bedding schistosity. Others insist that bedding schistosity is a kind of axial plane schistosity on the flanks of folds. We have studied the schistosity of the metamorphic rock series in
文摘Sicklerite is a secondary lithium phosphate mineral, a weathered product of the lithiophilite-triphilite series occurring in Li-rich pegmatite. Sicklerite was first found by Schall in 1912 in a pegmatite mine of California, U.S.A., and subsequently discovered in the Li-pegmatite of Sweden, U.S.S.R., France, Morocco, etc., so far no report of it has yet been made in China.
基金Project supported by the National Natural, Science Foundation of China.
文摘Many methods have been published in literature for automatical plotting of a stable equilibrium p-T diagram of an n-component system composed of n+2 phases. However, these methods are complicated, or allowable only for qualitative applications, or not universal.
文摘In 1980, we found a metallic mineral in a Cu-Ni deposit in Xinjiang. After X-ray powder study and microprobe analysis, it proved to be a Ni-bearing new variety of djerfisherite. Until now no report of it has been made in China. The Ni-djerfisherite has metallic lustre, size O.01—0.1mm in diameter, associated with pyrite, pentlandite,chalcopyrite and pyrrhotine, etc. The Ni-djerfisherite is concentrated in pyrrhotine, and is probably a product of pyrrhotine solid-solution decomposition.
基金Project supported by the National Natural Science Foundation of China
文摘Triplite （Mn, Fe, Mg, Ca）2 FPO4 is a kind of rare phosphate often occurring in pegmatite. Mineralogical and structural study as well as measurements of M（?）ssbauer spectra on triplite and related minerals have been made. Kostiner et al. showed that the M（?）ssbauer spectrum of triplite at room temperature consists of two
基金Project supported by the National Natural Science Foundation of China
文摘M(?)ssbauer effect has been widely applied to mineralogy. It is mainly used to determine iron valence, coordination number and Fe-Mg order-disorder. In addition, some useful information on multiple-phase meteorite and rock can be given. In re-
文摘Based on the results of research work and practices of the author, three kinds of methods and techniques for determining the fold shapes in the metamorphic rock region are advanced: (ⅰ) the microschist method, (ⅱ) the hook fold method and (ⅲ) the structural lenticular method. The theoretical foundation of these methods is structural transposition. The methods and techniques are successful both in practical and theoretical senses. We have gained fairly good effects by utilizing these methods.
文摘Tungsten in southeastern China is well-known to the world. Studies of tungsten ore have been reported for many decades, but silver in the ore has never been noted. In this paper description of a new variety of Ag-bearing mineral discovered in the Huangsha tungsten ore deposit is given.
