中国东北额尔古纳地块新太古代岩浆事件钻孔片麻状二长花岗岩锆石LA-ICP-MS测年证据

doi:10.13278/j.cnki.jjuese.201502103

摘要/Abstract

摘要：

额尔古纳地块基底岩石时代与构造属性一直颇受争议。笔者对额尔古纳地块南部比列亚铅锌多金属矿区ZK6301钻孔226 m片麻状二长花岗岩岩心进行了锆石LA-ICP-MS定年。测试结果显示,24个测试点的数据均在谐和线上,²⁰⁷Pb/²⁰⁶Pb年龄包括4个不同年龄区段,分别为:2 549~2 562 Ma(加权平均年龄为(2 555±19) Ma,MSWD=0.17,n=3),2 596~2 624 Ma(加权平均年龄为(2 606±17) Ma,MSWD=0.032,n=17),2 688~2 715 Ma(加权平均年龄为(2 702±18) Ma, MSWD=0.70,n=3),2 786 Ma(n=1)。通过锆石的Th,U质量分数与Th/U值分析,²⁰⁷Pb/²⁰⁶Pb年龄((2 606±17) Ma)代表了该片麻状二长花岗岩的结晶年龄;²⁰⁷Pb/²⁰⁶Pb年龄((2 549~2 562) Ma)很可能代表了构造热事件的作用年龄;本次报道的岩石结晶年龄,揭示了额尔古纳地块上存在新太古代的结晶基底。结合前人研究资料分析可知,额尔古纳地块上该期变质结晶基底可能在该地块的南、北部均有分布,并且得尔布干断裂可能并非该地块的南部边界。综合分析前寒武纪古老地块的演化历史可得出,额尔古纳地块经历了全球大陆构造旋回演化的完整过程。

关键词: 额尔古纳地块, 片麻状二长花岗岩, 锆石U-Pb年龄, 新太古代, 得尔布干断裂, 比列亚铅锌多金属矿区

Abstract:

The nature and age of the basement of Erguna massif had long been a geological controversy. The zircon LA-ICP-MS dating of the Gneissic monozgranite from the drill (No.ZK6301, Depth: 226 m) of the Pb-Zn polymetallic deposit in Biliya, southwestern Derbugan county has been conducted. The results yield 4 different groups of concordant age: 2 549-2 562 Ma(weighted-mean age:(2 555±19) Ma,MSWD=0.17,n=3),2 596-2 624 Ma(weighted-mean age(2 606±17) Ma,MSWD=0.032,n=17),2 688-2 715 Ma(weighted-mean age(2 702±18) Ma, MSWD=0.70,n=3),2 786 Ma(n=1). Their zircon U-Pb dating plots (24 out of 29 plots) show a remarkable consistence. Based on the zircon spot analysis for its Th,U content and Th/U ratios, the ²⁰⁷Pb/²⁰⁶Pb age of 2 549-2 562 Ma implies a late tectono-thermal event; and the weighted-mean age 2 606±17 Ma (MSWD=0.032,n=17) reflects the crystallization age in corresponding to the period of Neo-Archaean.In connection with the previous studies, the old basement of Erguna massif probably widely distributes in the south and north region. This suggests a far south extension of this massif beyond Derbugan fault. This can help to understand the palinspastic reconstruction for the eastern part of the Central Asian Orogenic Belt(CAOB).

Key words: Erguna massif, gneissic monzogranite, zircon U-Pb dating, Neo-Proterozoic, Derbugan fault, Biliya Pb-Zn polymetallic deposit

中图分类号:

P588.12

邵军, 李永飞, 周永恒, 王宏博, 张璟. 中国东北额尔古纳地块新太古代岩浆事件钻孔片麻状二长花岗岩锆石LA-ICP-MS测年证据[J]. 吉林大学学报(地球科学版), 2015, 45(2): 364-373.

Shao Jun, Li Yongfei, Zhou Yongheng, Wang Hongbo, Zhang Jing. Neo-Archaean Magmatic Event in Erguna Massif of Northeast China: Evidence from the Zircon LA-ICP-MS Dating of the Gneissic Monzogranite from the Drill[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(2): 364-373.

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