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[1]王继尧,杨言辰,黄永卫,等.黑龙江东部完达山地体蛇绿岩形成时代及其构造意义[J].地球科学与环境学报,2016,38(02):182-195.
　WANG Ji-yao,YANG Yan-chen,HUANG Yong-wei,et al.Formation Ages and Tectonic Significance of Ophiolites in Wandashan Terrane of the Eastern Heilongjiang[J].Journal of Earth Sciences and Environment,2016,38(02):182-195.
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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:
182-195
栏目:
基础地质与矿产地质
出版日期:
2016-03-15

文章信息/Info

Title:
Formation Ages and Tectonic Significance of Ophiolites in Wandashan Terrane of the Eastern Heilongjiang
文章编号:
1672-6561(2016)02-0182-14
作者:
王继尧; 杨言辰; 黄永卫; 侯玉树; 谈艳; 张国宾
1.吉林大学 地球科学学院,吉林 长春 130061; 2.黑龙江省第一地质勘察院,黑龙江 牡丹江 157000
Author(s):
WANG Ji-yao;  YANG Yan-chen;  HUANG Yong-wei;  HOU Yu-shu;  TAN Yan;  ZHANG Guo-bin
1. College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China; 2. The First Institute of Geology Exploration of Heilongjiang Province, Mudanjiang 157000, Heilongjiang, China
关键词:
蛇绿岩; 地球化学; 锆石U-Pb定年; 洋岛; 弧后盆地; 构造演化; 完达山地体; 黑龙江
Keywords:
ophiolite;  geochemistry;  zircon U-Pbdating;  oceanic island;  back arc basin;  tectonic evolution;  Wandashan terrane;  Heilongjiang
分类号:
P548;P581;P595
DOI:
-
文献标志码:
A
摘要:
对出露于完达山造山带的饶河蛇绿岩和跃进山蛇绿岩进行了岩石地球化学以及锆石U-Pb年代学的研究,以便了解其成因、形成时代以及它们所揭示的区域构造背景。饶河蛇绿岩TiO2含量高,高场强元素Nb、Ta、Hf、Zr等富集,大离子亲石元素Rb、Sr、Ba等相对富集,岩石样品球粒陨石标准化稀土元素配分模式及原始地幔标准化微量元素蛛网图与典型的洋岛玄武岩一致,总体表现出洋岛玄武岩的特征。跃进山蛇绿岩的微量元素特征兼具洋中脊拉斑玄武岩与岛弧拉斑玄武岩的属性,富集大离子亲石元素Rb、Ba、K、Sr等,亏损高场强元素Zr、Hf、Nb、Ta等,无负Eu异常,轻微富集轻稀土元素,形成于弧后环境。测年结果表明:饶河蛇绿岩的年龄为(219.0±2.4)Ma,跃进山蛇绿岩的年龄为(311±11)Ma。结合二者形成的构造环境,在晚石炭世—晚三叠世,黑龙江东部地区在古太平洋板块向西俯冲的背景下经历了洋岛或海山的剥落与拼贴以及“弧-盆”体系演化等复杂的地球动力学过程。
Abstract:
Rock geochemistry and zircon U-Pb dating are reported for Raohe and Yuejinshan ophiolites in Wandashan orogenic belt in order to understand its origin and age, and reveal their regional tectonic setting. Content of TiO2 is high, high field strength elements (Nb, Ta, Hf, Zr, etc.) are enriched, large ion lithophile elements (Rb, Sr, Ba, etc.) are relative enriched for Raohe ophiolite; chondritenormalized REE patterns and primitive mantle-normalized trace element spider diagrams of rock are consistent with that of the typical oceanic island basalt (OIB), showing the characteristics of OIB. The characteristics of trace elements of Yuejinshan ophiolite are both mid-ocean ridge tholeiite and island arc tholeiite, large ion lithophile elements (Rb, Ba, K, Sr, etc.) are enriched, high field strength elements (Zr, Hf, Nb, Ta, etc.) are depleted, Eu anomaly is not negative, LREE is enriched lightly, and Yuejinshan ophiolite is formed in back-arc environment. Dating results show the ages of Raohe and Yuejinshan ophiolites are (219.0±2.4)Ma and (311±11)Ma, respectively. Combined with the formation of tectonic environment, the eastern Heilongjiang in Late Paleozoic Late Triassic experiences a series of complicated geodynamic processes in the background of the westward subduction of Paleo-Pacific Plate, including the scaling and combining of oceanic island or seamount and “arc-basin” system evolution.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2015-12-15
基金项目:中国地质调查局地质大调查项目(1212011120342,12120113098300)
作者简介:王继尧(1990-),男,吉林永吉人,理学硕士研究生,E-mail:18744026513@163.com。
通讯作者:杨言辰(1965-),男,河南伊川人,教授,博士研究生导师,理学博士,E-mail:yyc@jlu.edu.cn。
更新日期/Last Update: 2016-03-28