冈底斯东段色日绒地区冈瓦纳相冰海杂砾岩特征及其意义

doi:10.11867/j.issn.1001-8166.2015.11.1239

地球科学进展 ›› 2015, Vol. 30 ›› Issue (11): 1239 -1249. doi: 10.11867/j.issn.1001-8166.2015.11.1239

秦松 ^{1, 2}, 孙传敏 ¹, 杨继友 ³, 张伟 ², 尼玛次仁 ⁴

1. 成都理工大学地球科学学院,四川成都, 610059;
2. 四川省地矿局区域地质调查队,四川成都, 610213;
3. 四川省地矿局402地质队,四川成都, 611730;
4. 西藏地勘局第二地质大队,西藏拉萨, 851400

收稿日期:2015-04-02 修回日期:2015-10-20 出版日期:2015-11-20
基金资助:
国家自然科学基金项目“地层序列中钾质斑脱岩等火山沉积物的确认及其测年研究”（编号：41272046）; 中国地质调查局项目“西藏色日绒地区矿产远景调查”（编号：1212011221077）资助

Characteristics and Its Significance of Glacial-marine Diamictite of Gondwana Facies in the Serirong Area, Eastern Gangdese Belt

Qin Song ^{1, 2}, Sun Chuanmin ¹, Yang Jiyou ³, Zhang Wei ², Nima Ciren ⁴

1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;
2. Regional Geological Survey Party, Sichuan Bureau of Geology and Mineral Exploration, Chengdu 610213, China;
3. No.402 Geological Party,Sichuan Bureau of Geology and Mineral Exploration, Chengdu 611730, China;
4. No.2 Geological Party,Xizang Bureau of Geology and Mineral Exploration, Lhasa 851400, China

Received:2015-04-02 Revised:2015-10-20 Online:2015-11-20 Published:2015-11-20
About author:First author: Qin Song (1986-), male, Meishan County, Sichuan Province, Doctoral Candidate. Research area include regional geological survey and research. E-mail: qinsong2004@163.com
Supported by:
Project supported by the National Natural Science Foundation of China “The research on recognizing and dating of volcanic sediments such as K-bentonites in stratigraphic sequence ”(No.41272046); The Geological Survey Project of Geological Survey of China “The strategic mineral prospective survey in Serirong Area, Tibet” (No.1212011221077)

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色日绒地区冰海杂砾岩产于砂泥质为主的陆缘碎屑岩段中,累计出露厚度约325 m。岩石学及沉积学特征指示其沉积于滨海—上部浅海环境;顶部的化石生物组合指示此段岩层沉积于晚石炭世—早二叠世的冷水型海洋环境。岩层中的坠石结构、压裂面以及与其同层位产出的冷水型生物群为冰海杂砾岩的成因提供了有力的证据,指示其形成于冰川作用下,是由冰筏搬运的海相沉积。通过资料综合收集、对比,确定了冰海杂砾岩形成的古构造及古地理、古气候控制条件。根据古构造位置及古地理特征,大致总结出了以该地区为代表的冈瓦纳相冰海杂砾岩的沉积及成因模式。

关键词: 早二叠世, 冰海杂砾岩, 沉积环境, 色日绒地区, 晚石炭世—, 冈瓦纳相

Glacial marine diamictite of Serirong area comes from “arenopelitic suspended substance based” terrrigenous clastic rock and its exposing height is about 325 m. The petrology and sedimentary characteristics of these strata indicate the coastal-epactile environment; Fossil assemblage on the top indicate the cold water environment in Late Carboniferous-Early Permian. The dropstone, fracturing fracture and cold water biota from this strata providing forceful evidence on the cause of glacial-marine diamictite’s formation, and the characteristics above show that the glacial-marine diamictite deposited in the glaciers effects by the transportation of ice-raft. Through the information collection and comparison, explicating the controlling conditions of paleostructure, palaeogeography and paleoclimate were identified. Based on the characteristics of paleostructure, palaeogeography and paleoclimate, summarizing the genetic and deposition model of glacial-marine diamictite of gondwana facies in this area were identified. The sedimentary of glacial-marine diamictite and cold water biota in the Serirong area shows that gondwana facies deposited in the cold environment.

Key words: Late Carboniferous-Early Permian, Serirong area, Gondwana facies, Deposition model, Glacial-marine diamictite

中图分类号:

P588.21+2.5

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