辽东石庙沟岩体岩石地球化学特征、锆石U-Pb年龄、Hf同位素及其地质意义

doi:10.13278/j.cnki.jjuese.20190214

吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (2): 429-441.doi: 10.13278/j.cnki.jjuese.20190214

辽东石庙沟岩体岩石地球化学特征、锆石U-Pb年龄、Hf同位素及其地质意义

王世成¹, 杨仲杰², 杨菊³, 张璟⁴, 孙守亮⁴, 刘长纯²

1. 核工业二四三大队, 内蒙古赤峰 024000;
2. 辽宁省地质矿产调查院有限责任公司, 沈阳 110031;
3. 河北省区域地质调查院, 河北廊坊 065000;
4. 中国地质调查局沈阳地质调查中心, 沈阳 110034

收稿日期:2019-10-08 出版日期:2021-03-26 发布日期:2021-04-06
通讯作者: 杨仲杰(1987-),男,高级工程师,主要从事区域地质调查与固体矿产勘查方面的研究,E-mail:yangzj870227@163.com E-mail:yangzj870227@163.com
作者简介:王世成(1986-),男,高级工程师,主要从事区域地质调查与固体矿产勘查方面的研究,E-mail:wangshicheng243@163.com
基金资助:
中国地质调查局项目（DD20160049）

Geochemical, Zircon U-Pb Age, Hf Isotope and Geological Significance of Early Cretaceous Granite-Porphyry in Shimiaogou Area, Eastern Part of Liaoning Province

Wang Shicheng¹, Yang Zhongjie², Yang Ju³, Zhang Jing⁴, Sun Shouliang⁴, Liu Changchun²

1. No. 243 Geological Party, China National Nuclear Corporation, Chifeng 024000, Inner Mongolia, China;
2. Liaoning Survey Academy Limited Liability Company of Geology and Mineral Resources, Shenyang 110031, China;
3. Regional Geological Survey of Hebei Province, Langfang 065000, Hebei, China;
4. Shenyang Center, China Geological Survey, Shenyang 110034, China

Received:2019-10-08 Online:2021-03-26 Published:2021-04-06
Supported by:
Supported by the Project of China Geological Survey(DD20160049)

摘要/Abstract

摘要： 辽东石庙沟地区位于华北陆块东部的辽吉造山/活动带上，该带经历了十分复杂的构造演化过程，记录了多期岩浆-构造-变质事件。石庙沟岩体为花岗斑岩，富SiO₂、Na₂O和K₂O，贫CaO、MgO及Al₂O₃，亏损高场强元素（Nb、Ti、Ta、P），富集大离子亲石元素（K、Rb、Ba、U），A/CNK值大于1，REE配分曲线呈"海鸥"式分布，以具有显著的负Eu异常为特征，高Ga/Al值，与典型A型花岗岩特征一致。花岗斑岩中锆石的LA-ICP-MS U-Pb测年结果表明其成岩年龄为（123.0±1.6）Ma，为早白垩世。锆石Hf同位素分析表明，ε_Hf（t）值均为负值，介于-15.72~-12.85之间，平均值为-14.14，二阶段模式年龄（T_DM2）在2 164~1 989 Ma之间，平均为2 067 Ma，反映源岩以大陆壳成分为主。结合花岗斑岩高SiO₂，低Mg、Co、Cr、Ni，且富集LREE和LILE，亏损HFSE等特征，表明早白垩世花岗斑岩岩浆应为大陆地壳物质熔融的产物。根据年代学和岩石地球化学研究认为，早白垩世花岗斑岩是古太平洋板块向欧亚大陆板块俯冲所形成的活动大陆边缘弧花岗岩。研究区早白垩世花岗斑岩的形成主要受太平洋构造域的影响，形成环境受板块俯冲造山后伸展作用和下地壳拆沉作用的联合制约，是辽东地区岩石圈减薄的直接证据。

关键词: 早白垩世, 花岗斑岩, 岩石地球化学, 锆石U-Pb年龄, Hf同位素, 辽东石庙沟

Abstract: The Shimiaogou area in Liaodong is tectonically located in the Liao-Ji orogenic/active belt in the eastern part of the North China block,which has experienced a very complex tectonic evolution with multiple magma-tectono-metamorphic events. The Shimiaogou rock mass is of granite porphyry,rich in SiO₂,Na₂O, and K₂O,poor in CaO, MgO, and Al₂O₃; It lacks high field strength elements (Nb, Ti,Ta and P) but is rich in large ion lithophile elements(K, Rb, Ba, U) with A/CNK values greater than 1; The REE distribution curve shows"seagull"type, characterized by significant negative Eu anomaly,and Ga/Al value is consistent with the typical characteristics of type A granite. The granite-porphyry magmatic zircon LA-MC-ICP-MS U-Pb dating results show that its rock age was (123.0±1.6) Ma in the Early Cretaceous. Through Hf isotope analysis,the ε_Hf(t) values are between -15.72 and -12.85 with the average of -14.14 and the two stage model age(T_DM2) is between 2 164 and 1 989 Ma with an average of 2 067 Ma,reflecting the main continental crust composition of the source rock. Furthermore, combined with the characteristics of high SiO₂,low Mg,Co,Cr,Ni, enrichment of LREE and LILE and loss of HFSE,it is suggested that the Early Cretaceous granite porphyry magma should be the melting product of continental crust material formed under the subduction of the Pacific plate beneath the Eurasian plate in the active continental margin. The Early Cretaceous environment of Liaodong region is affected by the subduction post-tectonic extension and lower crust delamination. The formation of the Early Cretaceous granite porphyry is controlled by Pacific tectonic domain,the dynamic environment formed in the lithosphere stretching is a direct evidence of lithospheric thinning in Liaodong area.

Key words: Early Cretaceous, granite porphyry, rock geochemical, zircon U-Pb age, Hf isotope, Shimiaogou area,the eastern part of Liaoning Province

中图分类号:

P588.12

王世成, 杨仲杰, 杨菊, 张璟, 孙守亮, 刘长纯. 辽东石庙沟岩体岩石地球化学特征、锆石U-Pb年龄、Hf同位素及其地质意义[J]. 吉林大学学报(地球科学版), 2021, 51(2): 429-441.

Wang Shicheng, Yang Zhongjie, Yang Ju, Zhang Jing, Sun Shouliang, Liu Changchun. Geochemical, Zircon U-Pb Age, Hf Isotope and Geological Significance of Early Cretaceous Granite-Porphyry in Shimiaogou Area, Eastern Part of Liaoning Province[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(2): 429-441.

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辽东石庙沟岩体岩石地球化学特征、锆石U-Pb年龄、Hf同位素及其地质意义

Geochemical, Zircon U-Pb Age, Hf Isotope and Geological Significance of Early Cretaceous Granite-Porphyry in Shimiaogou Area, Eastern Part of Liaoning Province

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