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Terrane analysis of Mesozoic complexes in East Asia

东亚中生代杂岩的地体分析

基本信息

批准号：
03041037
负责人：
MIZUTANI Shinjiro
金额：
$ 3.2万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1991
资助国家：
日本
起止时间：
1991 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03041037/
关键词：
Feng-Hui terrane Ndadanhada terrane Triassic North China Block South China Block Qinling Belt East Asia Collision

项目摘要

According to the exchange program between Nanjing University and Nagoya University, we have carried out a special cooperative work on the geological structure of the Asian continent. This work suggests that one of the key-terranes in East Asia is the Nadanhada terrane of northeast China, and the other is a terrane in the Qinling Belt. On the basis of these investigations, we continued our studies in this project on (1) the Nadanhada terrane, and on (2) the western part of the Qinling Belt. (A) S. Mizutani, J. A. Shao and Q. Yang have performed the geological and micropaleontological investigations of the Triassic-Jurassic radiolarian rocks of the Nadanhada terrane, and disclosed that i) the radiolarians are commonly found in a formation straddling on the boundary between Triassic and Jurassic age, ii) the radiolarian assemblages belonging to the Triassic and the Jurassic are very similar to each other between China and Japan, and iii) in spite of these similarities, the lithological nature of the host-rock from which the fossils have been extracted is somewhat different ; the rock is bedded chert in Japan, whereas it is siliceous shale in China. (B) S. Mizutani, T. Ishikawa, I. Hattori and H. Nagai together with the Chinese geologists (Q. L. Zhang and Z. F. Sun) visited the western part of the Qinling Belt. The Triassic Feng-Hui terrane composed of epiclastic complex is recognized there ; in addition, a Devonian coarseclastic stratigraphic terrane may well be distinguished. Presence of these terranes implies that the Qinling Belt itself is an elongated collage zone developed in a suture between North China Block and South China Block.

根据南京大学和名古屋大学的交流计划，我们开展了关于亚洲大陆地质构造的专项合作工作。这项工作表明，东亚的一个关键地体是中国东北部的那丹哈达地体，另一个是秦岭带的一个地体。在此基础上，我们继续对(1)那丹哈达地体和(2)秦岭带西段进行了研究。(A)S·Mizutani，J.A.Shao和Q.Yang对Nadanhada地体的三叠纪-侏罗纪放射虫岩石进行了地质和显微古生物调查，揭示：1)横跨三叠纪和侏罗纪交界的地层中普遍存在放射虫；2)中国与日本三叠纪和侏罗纪的放射虫组合非常相似；3)尽管有这些相似之处，但提取化石的寄主岩石的岩性有所不同：日本为层状硅质岩，而中国为硅质页岩。(B)S.Mizutani、T.Ishikawa、I.Hattori和H.Nagai与中国地质学家张庆林和孙振飞一起访问了秦岭带西部。识别出由碎屑杂岩组成的三叠纪风回地体，并可识别泥盆纪粗碎屑地层地体。这些地体的存在意味着秦岭带本身是在中国地块北部和中国地块南部之间的缝合线上发育的拉长拼贴带。