摘要
新疆天山东部广泛发育晚石炭世碳酸盐岩隆。这些岩隆主要为生物丘，少数为生物滩及与岩隆有关的生物层，其中生物丘含大量灰泥和内碎屑。基本岩石类型为泥粒状灰岩、粒泥状灰岩、粒泥状－泥粒状灰岩，少量岩石类型包括颗粒岩、骨架岩和障积岩。成岩作用是碳酸盐岩隆发展演化的重要阶段和过程，在生物丘内，已经识别出四种重要的胶结物，即球粒泥晶、纤状方解石、放射轴状方解石和粒状方解石。尽管缺失典型的造礁生物，但通过岩石类型研究和微相分析，认为碳酸盐岩隆的形成主要取决于生物作用及古环境格局。
Late
Carboniferous carbonate buildups are well exposed in Northern Xinjiang, China, where they
usually form some mound like or escarpments along both flanks of the Tianshan Mountains.
Three types of the carbonate buildups have been recognized, including mounds, organic banks
and biostromes. Mounds, as a main type of the carbonate buildups in eastern Tianshan
Mountains, are characterized by cores of massive nonbedded algea and bryozoan packstones
and wackestones. These limestones contain high percentages of lime mud and fine bioclastic
debris as interstitial material. Besides packstones and wackestones, other types of the rocks,
such as wacke packstones, framestones and bafflestones can be found in some buildups in the
region. The diagenesis of the carbonate buildups have been discussed in detail,
especially the cementation of the mounds. Four types of cements have been identified:a)
peloidal micritic calcite cenment; b) fiberous calcite cement. c) rediaxial calcite cement which is
composed of radially arranged prismatic calcite crystals with curved cleavages and rombic
ends; and d) blocky calcite cement. Based on the general characteristics, the carbonate
buildups growth development in eastern Tianshan Mountains are very similar to those in
Waulsortian buildups, Europe in organic and carbonate cement components.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第4期559-567,共9页
Acta Petrologica Sinica
基金
中国科学院院长基金
关键词
碳酸岩盐
岩隆
岩石学
成岩作用
晚石炭世
Late Carboniferous
Carbonate buildups
Petrology
Diagenesis
Xinjiang
