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引用本文:贺承广,王世炎,方怀宾,柴建玉,苏建仓,常永伟,王柳林,陈登辉. 西昆仑塔什库尔干马尔洋岩组的厘定及控矿意义[J]. 中国地质, 2019, 46(3): 517-536.
HE Chengguang,WANG Shiyan,FANG Huaibin,CHAI Jianyu,SU Jiancang,CHANG Yongwei,WANG Liulin,CHEN Denghui. Redefination and ore-forming significance of Maeryang Forming, Taxkorgan, Western Kunlun Mountains[J]. Geology in China, 2019, 46(3): 517-536(in Chinese with English abstract).
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西昆仑塔什库尔干马尔洋岩组的厘定及控矿意义
贺承广1,2, 王世炎1,2, 方怀宾1,2, 柴建玉1,2, 苏建仓1,2, 常永伟1,2, 王柳林1,2, 陈登辉3
1.河南省地质调查院, 河南 郑州 450001;2.河南省金属矿产成矿地质过程与资源利用重点实验室, 河南 郑州 450001;3.中国地质调查局西安地质调查中心, 陕西 西安 710054
摘要:
塔什库尔干大型铁矿成矿带位于昆仑造山带西段,原岩恢复表明该区含铁岩系主要为一套双峰式火山岩-碎屑岩-碳酸盐岩建造组合,岩石普遍遭受绿片岩相变质和多期构造变形。本文报道了在老并一带变安山岩中获得的LA-ICP-MS锆石U-Pb同位素年龄值(603±10)Ma,并结合前人年龄数据,将原划古元古界布伦阔勒岩群的含铁岩系厘定为震旦系-寒武系纽芬兰统马尔洋岩组(Z€1m),其内发育典型的双峰式火山岩组合,证实了区内震旦纪-早寒武世仍处于拉张伸展背景,变质火山-沉积组合特征表明其形成于大陆边缘裂谷构造环境。含铁岩系典型的膏(钡)-铁建造很可能为新元古代晚期"Marinoan雪球"冰期后地球系统变化的火山-沉积响应。
关键词:  西昆仑  塔什库尔干  含铁岩系  马尔洋岩组  震旦系-寒武系  陆缘裂谷  Marinoan雪球
DOI:10.12029/gc20190306
分类号:P597+.3
基金项目:中国地质调查局“新疆1:5万干豆尔那汗达坂、马尔洋、皮下尼牙提幅区域地质调查”项目(12120114081801)资助。
Redefination and ore-forming significance of Maeryang Forming, Taxkorgan, Western Kunlun Mountains
HE Chengguang1,2, WANG Shiyan1,2, FANG Huaibin1,2, CHAI Jianyu1,2, SU Jiancang1,2, CHANG Yongwei1,2, WANG Liulin1,2, CHEN Denghui3
1.Henan Institute of Geological Survey, Zhengzhou 450001, Henan, China;2.Henan Key Laboratory for Metal Mineral Ore-forming Geological Process and Utilization of Resource, Zhengzhou 450001, Henan, China;3.Xi'an Center of Geological Survey, CGS, Xi'an 710054, Shaanxi, China
Abstract:
The Taxkorgan large-scale iron metallogenic belt is located in the western part of Kunlun orogenic belt. Research on metamorphic rocks shows that the protolith of the iron-bearing strata is a assemblage of bimodal volcanic rocks-clastic rockscarbonate rocks formation. The strata have undergone widespread greenschist facies metamorphism and multi-superimposed deformation. The meta-andesite in Laobing area yielded an U-Pb ziron age of (603±10) Ma, suggesting that the eruption age of volcanic rocks is early Sinian. Combined with other age data available, the authors redefined the iron-bearing strata as "SinianCambrian Terreneuvian Maeryang Formation" (Z€1m.), which doesn't belong to the previously defined "Paleoproterozoic Bulunkuole Group". The formation of the bimodal volcanic rocks proved that there was an extensional tectonic event in Taxkorgan area from Sinian to early Cambrian. Discrimination of tectonic setting on the metamorphic volcano-sedimentary formation indicates that the iron-bearing strata were formed in the continental margin rift. The gypsum (Ba)-iron formation was the volcanosedimentary response to the changes of "Marinoan Snowball Earth"'system after late Neoproterozoic glacial event.
Key words:  Western Kunlun  Taxkorgan  iron-bearing strata  Maeryang Formation  bimodal volcanic rocks  Simian -Cambrian  margin rift  Marinoan Snowball