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[1]陈鑫,郑有业,许荣科,等.柴北缘超高压变质带折返过程对金红石成矿的制约：来自鱼卡和铁石观西地区石榴石成分环带的证据[J].地球科学与环境学报,2016,38(02):143-159.
　CHEN Xin,ZHENG You-ye,XU Rong-ke,et al.Exhumation Processes of UHP Metamorphic Belt in the Northern Qaidam and Their Constraints to Rutile Mineralization: Evidences from Compositional Zoning of Garnets in Yuqia and West Tieshiguan Areas[J].Journal of Earth Sciences and Environment,2016,38(02):143-159.
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柴北缘超高压变质带折返过程对金红石成矿的制约：来自鱼卡和铁石观西地区石榴石成分环带的证据(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第38卷
期数:
2016年第02期
页码:
143-159
栏目:
基础地质与矿产地质
出版日期:
2016-03-15

文章信息/Info

Title:
Exhumation Processes of UHP Metamorphic Belt in the Northern Qaidam and Their Constraints to Rutile Mineralization: Evidences from Compositional Zoning of Garnets in Yuqia and West Tieshiguan Areas
文章编号:
1672-6561(2016)02-0143-17
作者:
陈鑫; 郑有业; 许荣科; 国显正; 王会敏; 蔡鹏捷; 杜文洋; 林成贵; 方昌坦; 卢锐; 范贤斌
1.中国地质大学(武汉) 资源学院,湖北 武汉 430074; 2.中国地质大学(武汉) 地质调查研究院,湖北 武汉 430074; 3.中国地质大学(北京) 地球科学与资源学院,北京 100083
Author(s):
CHEN Xin;  ZHENG You-ye;  XU Rong-ke;  GUO Xian-zheng;  WANG Hui-min;  CAI Peng-jie;  DU Wen-yang;  LIN Cheng-gui;  FANG Chang-tan;  LU Rui;  FAN Xian-bin
1. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, Hubei, China; 2. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, Hubei, China; 3. College of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
关键词:
石榴石; 主量元素; 微量元素; 金红石矿床; 榴辉岩; 超高压变质带; 柴达木盆地
Keywords:
garnet;  major element;  trace element;  rutile deposit;  eclogite;  UHP metamorphic belt;  Qaidam Basin
分类号:
P588.3
DOI:
-
文献标志码:
A
摘要:
鱼卡和铁石观西榴辉岩均位于柴北缘超高压变质带,近期在鱼卡地区发现了大型以上的榴辉岩型金红石矿床,但在铁石观西地区仅发现钛矿化,两区成矿前景不同。在对两区进行详细野外地质观测、镜下观察及电子探针分析的基础上,通过LA-ICP-MS系统研究了榴辉岩中石榴石的主、微量元素特征等。结果表明:鱼卡和铁石观西榴辉岩虽然产状基本一致,但鱼卡榴辉岩基本无退变,石榴石较自形,含较多的包裹体,石榴石中的主、微量元素成分呈环带分布,幔边部富集稀土元素,而铁石观西榴辉岩退变较强,矿物他形,石榴石包裹体数量较少,部分石榴石单矿物主量元素环带已经被均一化,核幔部相对边部更富集稀土元素。结合年代学等证据,鱼卡榴辉岩的形成经历了相对快速俯冲和折返的动力学过程,钛成矿作用中金红石很少转变为钛铁矿,而铁石观西榴辉岩经历了一个快速俯冲而折返速率较缓慢的动力学过程,钛成矿作用中金红石大多转变成了钛铁矿。揭示鱼卡和铁石观西钛物相、动力学过程等差异的原因及标志,为柴北缘超高压变质带内进一步寻找榴辉岩型金红石矿床提供了依据与方向。
Abstract:
The ore-forming prospect of eclogite-type rutile in Yuqia is different from that in West Tieshiguan, located in the northern Qaidam ultrahigh-pressure(UHP) metamorphic belt. Recently, the large eclogite-type rutile ore deposit in Yuqia is found, but only titanium mineralization in West Tieshiguan is found. Based on detailed field geological and microscopic observation, the major elements were analyzed by electron probe; moreover, the in-situ trace element contents in garnet collected from the deposits were performed by LA-ICP-MS. The results show that the occurrences of Yuqia and West Tieshiguan eclogites are basically identical. Yuqia eclogite degenerates weakly with mineral idiomorphic granular, and garnets contain more inclusions. Major and trace earth elements have well-developed zoning characteristic, and the mantle and rim enrich rare earth element in garnets. Relatively, the degeneration of West Tieshiguan eclogite is strong and mineral xenomorphic-granular. Some garnets of eclogites contain less inclusions and the zoning of major element has been homogenized, rare earth elements of the core and mantle are more than the side. Combining the chronology evidences, Yuqia eclogite undergoes rapid subduction and exhumation of the dynamic process, and the rutiles barely turn into ilmenites. West Tieshiguan eclogite undergoes an evolution history with a rapid burial and slow uplift, and the rutiles nearly turn into ilmenites, which reveal the differences between the dynamics process and the occurrence state of rutile. These characters provide directions for the study area to further find eclogite-type rutile deposits in the northern Qaidam UHP metamorphic belt.

参考文献/References:

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　ZHANG Li-cheng,WANG Yi-tian,CHEN Xue-feng,et al.Characteristic of REE of Hongyuntan Iron Deposit in the Eastern Tianshan of Xinjiang and Its Genetic Significance[J].Journal of Earth Sciences and Environment,2013,35(02):32.
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备注/Memo

备注/Memo:
收稿日期:2015-11-17
基金项目:中国地质调查局地质大调查项目(1212011121204);教育部长江学者和创新团队发展计划项目(IRT14R56)
作者简介:陈 鑫(1991-),男,湖南溆浦人,工学博士研究生,E-mail:18766969211@163.com。
通讯作者:郑有业(1962-),男,河南信阳人,教授,博士研究生导师,理学博士,E-mail:zhyouye@163.com。
更新日期/Last Update: 2016-03-28