青海石底泉构造混杂岩带物质组成及其地质意义
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摘要
在1∶5万地质填图的基础上,运用剖面绘制、岩石学等方法,对工作区内宗务隆构造带--石底泉地区构造混杂岩带进行了详细研究。结果表明:石底泉构造混杂岩带组成复杂,均由基质和不同性质的构造岩块两部分构成,其中构造岩块以土尔根大坂组地层岩块和达肯大坂岩群基底岩块为主,基质主要为中浅部构造层次的构造片岩;石底泉构造混杂带的构造变形可分为两个阶段:华里西晚期-印支期和喜山期。其中华里西晚期-印支期为主构造期;石底泉地区构造混杂岩带的厘定是宗务隆构造带的又一重要证据,它与该区前人岩石学、年代学证据一起构成混杂岩带的完整标志,对恢复该地区古板块体制及构造演化具有重要意义。
Based on 1:50 000 regional geological mapping in the Shidiquan area,by using methods of detailed field section measurement and petrologic analysis,the author conducted detailed study on the Zongwulong tectonic belts in Shidiquan area. The results show that the composition of tectonic melanges in Shidiquanarea is complex,which is composed of matrix and tectonic massif with different properties. The tectonic massif mainly consists of Tuergendaban formation rocks and Dakendaban base rocks,and the matrix mainly is tectonic schist from middle-shallow crust. The tectonic evolution of Shidiquan tectonic melange belt can be divided into 2 stages: late Variscan-Indosinian and Himalayan,the late Variscan-Indosinian is the main tectonic period. The confirmation of the tectonic melange belt in the Shidiquan area is another important evidence for the Zongwulong tectonic belt,which,together with the predecessors' petrological and chronological evidence,constitute a complete sign for the tectonic melange belt,and has important significance for the recovery of the region plate system and tectonic evolution.
Based on 1:50 000 regional geological mapping in the Shidiquan area,by using methods of detailed field section measurement and petrologic analysis,the author conducted detailed study on the Zongwulong tectonic belts in Shidiquan area. The results show that the composition of tectonic melanges in Shidiquanarea is complex,which is composed of matrix and tectonic massif with different properties. The tectonic massif mainly consists of Tuergendaban formation rocks and Dakendaban base rocks,and the matrix mainly is tectonic schist from middle-shallow crust. The tectonic evolution of Shidiquan tectonic melange belt can be divided into 2 stages: late Variscan-Indosinian and Himalayan,the late Variscan-Indosinian is the main tectonic period. The confirmation of the tectonic melange belt in the Shidiquan area is another important evidence for the Zongwulong tectonic belt,which,together with the predecessors' petrological and chronological evidence,constitute a complete sign for the tectonic melange belt,and has important significance for the recovery of the region plate system and tectonic evolution.
引文
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张雪亭,杨生德.2007.青海省区域地质概论[M].北京:地质出版社.
葛肖虹,刘俊来.2000.被肢解的“西域克拉通”[J].岩石学报,16(1):59-66.
郭安林,张国伟,强娟,等.2009.青藏高原东北缘印支期宗务隆造山带[J].岩石学报,25(1):1-12.
郝国杰,陆松年,王惠初,等.2004.柴达木盆地北缘前泥盆纪构造格架及欧龙布鲁克古陆块地质演化[J].地学前缘,11(3):115-122.
胡受权,郭文平,曹运江,等.2001.柴达木盆地北缘构造格局及在中、新生代的演化[J].新疆石油地质,22(1):13-16.
李荣社,计文化,杨永成,等.2008.昆仑山及邻区地质[M].北京:地质出版社.
孟繁聪,张建新,杨经绥.2005.俯冲的大陆岛弧---柴北缘片麻岩的地球化学和同位素证据[J].地质学报,79(1):46-55.
宁蒙.2015.青藏高原东北缘碧口地块逆冲推覆构造结构与运动学研究[D].北京:中国地质大学(北京).
潘桂棠,李兴振.2002.青藏高原及邻区大地构造单元初步划分[J].地质通报,21(11):701-707.
彭渊,马寅生,刘成林,等.2016.柴北缘宗务隆构造带印支期花岗闪长岩地质特征及其构造意义[J].地学前缘,23(2):206-221.
彭渊.2015.柴北缘宗务隆构造带海西晚期-印支期构造特征研究[D].北京:中国地质科学院.
强娟.2008.青藏高原东北缘宗务隆构造带花岗岩及其构造意义[D].西安:西北大学.
青海省地质矿产局.1997.青海省岩石地层[M].北京:中国地质大学出版社,1-340.
孙娇鹏,陈世悦,彭渊,等.2015.柴达木盆地北缘宗务隆构造带早古生代锆石SHRIMP年龄的测定及其地质意义[J].地质论评,61(4):743-751.
王苏里,周立发.2016.宗务隆山角闪辉长岩LA-ICP-MS锆石U-Pb定年、地球化学特征及其地质意义[J].西北大学学报:自然科学版,46(5):716-724.
王毅智,陆海莲.2001.青海天峻南山蛇绿岩的地质特征及其形成环境[J].青海国土经略,(1):29-35.
辛后田,王惠初,周世军.2006.柴北缘的大地构造演化及其地质事件群[J].地质调查与研究,29(4):311-320.
张雪亭,杨生德.2007.青海省区域地质概论[M].北京:地质出版社.