The Huangtuliang monzonitic granite outcrops on the northern side of the Huangtuliang gold mining district, Chicheng, North Hebei Province. Our predecessors only made isotopic age determination using the K-Ar method. ...The Huangtuliang monzonitic granite outcrops on the northern side of the Huangtuliang gold mining district, Chicheng, North Hebei Province. Our predecessors only made isotopic age determination using the K-Ar method. Through LA-MC-ICP-MS zircon U-Pb dating and zircon Hf isotopic composition determination, this study acquired the age of 244.8±2.0 Ma(MSWD=0.57) on the basis of the weighed mean 206Pb/238U ratio, indicating that the Huangtuliang monzonitic granite was formed during the Middle Triassic period, which is the product of Early Indosinian magmatic activities in the region of North Hebei. εHf(t) values vary relatively evenly, within the range of-10.65--14.03, with an average of-12.14. The two-stage evolution model ages, tDM2, vary between 1943 and 2144 Ma, implying that the rock-forming materials of the Huangtiliang monzonitic granite mainly came from the Paleoproterozoic recirculated crustal materials, though a small quantity of enriched-mantle materials would have been involved.展开更多
With the rapid development of network technology,education informatization has become an inevitable trend in education reform and development.An important aspect of information teaching is the effective integration of...With the rapid development of network technology,education informatization has become an inevitable trend in education reform and development.An important aspect of information teaching is the effective integration of information technology and course teaching.On the basis of fully understanding and considering the learning needs of students,we should clarify the teaching goals of mountain tourism resources,integrate relevant teaching content,select appropriate information teaching strategies and methods,and achieve the optimization of teaching effects,so that students can really effectively play the role of the main body in teaching.In the teaching process of mountain tourism resources,the use of information-based teaching methods is not the more the better,but an effective combination of corresponding information teaching methods should be explored instead,such as learning the formation of Mount Tai through 3D animation,learning the lithology of Mount Tai through VR,etc.,so that not only can students learn easily and efficiently,but the workload of teachers can be reduced as well.展开更多
基金financially supported jointly by the Geological Investigation Item sponsored by the China Geological Survey (No. 1212011220492)the Scientific Research Base of China’s Typical Metallic Ores (No. 200911007)the National Natural Science Foundation of China (40872137)
文摘The Huangtuliang monzonitic granite outcrops on the northern side of the Huangtuliang gold mining district, Chicheng, North Hebei Province. Our predecessors only made isotopic age determination using the K-Ar method. Through LA-MC-ICP-MS zircon U-Pb dating and zircon Hf isotopic composition determination, this study acquired the age of 244.8±2.0 Ma(MSWD=0.57) on the basis of the weighed mean 206Pb/238U ratio, indicating that the Huangtuliang monzonitic granite was formed during the Middle Triassic period, which is the product of Early Indosinian magmatic activities in the region of North Hebei. εHf(t) values vary relatively evenly, within the range of-10.65--14.03, with an average of-12.14. The two-stage evolution model ages, tDM2, vary between 1943 and 2144 Ma, implying that the rock-forming materials of the Huangtiliang monzonitic granite mainly came from the Paleoproterozoic recirculated crustal materials, though a small quantity of enriched-mantle materials would have been involved.
文摘With the rapid development of network technology,education informatization has become an inevitable trend in education reform and development.An important aspect of information teaching is the effective integration of information technology and course teaching.On the basis of fully understanding and considering the learning needs of students,we should clarify the teaching goals of mountain tourism resources,integrate relevant teaching content,select appropriate information teaching strategies and methods,and achieve the optimization of teaching effects,so that students can really effectively play the role of the main body in teaching.In the teaching process of mountain tourism resources,the use of information-based teaching methods is not the more the better,but an effective combination of corresponding information teaching methods should be explored instead,such as learning the formation of Mount Tai through 3D animation,learning the lithology of Mount Tai through VR,etc.,so that not only can students learn easily and efficiently,but the workload of teachers can be reduced as well.
