[1]王志强,李娟,王丽娟,等.兴安地块南段哈达地区中晚侏罗世侵入岩成因及对蒙古-鄂霍茨克洋演化的制约[J].华东地质,2023,44(04):386-401.[doi:10.16788/j.hddz.32-1865/P.2023.04.003]
　WANG Zhiqiang,LI Juan,WANG Lijuan,et al.Petrogenesis of the Middle to Late Jurassic diorite and granite from Hada area in the Southern Xing’an Block and its restriction on the evolution of the Mongol-Okhotsk Ocean[J].East China Geology,2023,44(04):386-401.[doi:10.16788/j.hddz.32-1865/P.2023.04.003]
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兴安地块南段哈达地区中晚侏罗世侵入岩成因及对蒙古-鄂霍茨克洋演化的制约()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
44
期数:
2023年04期
页码:
386-401
栏目:
其他
出版日期:
2023-12-27

文章信息/Info

Title:
Petrogenesis of the Middle to Late Jurassic diorite and granite from Hada area in the Southern Xing’an Block and its restriction on the evolution of the Mongol-Okhotsk Ocean
作者:
王志强1;  李娟2;  王丽娟3;  李猛兴1
1. 山西省地质调查院有限公司, 山西太原 030006;
2. 山东省烟台第十一中学, 山东烟台 264000;
3. 中国地质科学院水文地质环境地质研究所, 河北石家庄 050061
Author(s):
WANG Zhiqiang1;  LI Juan2;  WANG Lijuan3;  LI Mengxing1
1. Shanxi Institute of Geological Survey Co., ltd, Taiyuan 030006, Shanxi, China;
2. Yantai NO. 11 Middle School of Shandong, Yantai 264000, Shandong, China;
3. The Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, Hebei, China
关键词:
兴安地块; 蒙古-鄂霍茨克洋; I型花岗岩; 中晚侏罗世
Keywords:
Xing’an Block; the Mongol-Okhotsk Ocean; I-type granite; Middle to Late Jurassic
分类号:
P51P59
DOI:
10.16788/j.hddz.32-1865/P.2023.04.003
摘要:
中晚侏罗世是东北地区构造演化中的一个重要转折时期,但该时期岩浆岩出露相对少,研究程度低。文章对兴安地块南段的中晚侏罗世侵入岩首次进行了LA-ICP-MS锆石U-Pb年代学、岩石地球化学研究,分析岩石成因与地质意义,进一步限定蒙古-鄂霍茨克洋在兴安地块南段的闭合时限。研究表明:侵入岩包括花岗斑岩、闪长玢岩2种岩性,成岩年龄分别为(167.0±0.5) Ma、(160.0±0.7) Ma,为中晚侏罗世岩浆作用的产物;岩石具有富钠(Na2O含量分别为4.57％~4.97％、3.21％~3.98％)、准(弱)铝质(A/CNK分别为1.00~1.07、0.93~1.10)的特点,属于高钾钙碱性系列的I型花岗岩;具有富集Rb、Th和K等大离子亲石元素,亏损Ta、Nb、P和Ti等高场强元素,稀土元素总量中等(ΣREE分别为(90.5~153.1)×10-6、(111.6~128.8)×10-6),轻稀土元素相对重稀土元素分馏明显(LREE/HREE值分别为6.74~10.26、5.14~8.84,(La/Yb)N分别为5.61~9.58、4.92~10.38),中低负铕异常(δEu分别为0.58~0.68、0.83~1.02)的微量元素特征。推断侵入岩成因很可能与蒙古-鄂霍茨克洋的闭合有关,形成于加厚陆壳坍塌或拆沉作用下的构造背景,即挤压向伸展构造转换阶段。
Abstract:
The Middle to Late Jurassic is an important transitional period in the tectonic evolution of Northeast China, the study of magmatic rocks during this period is relatively limited due to its rare exposure. In this study, LA-ICP-MS zircon U-Pb geochronology and rock geochemistry were used for the first time to investigate the Middle to Late Jurassic intrusive rocks located in the southern part of the Xing’an Block, analyzing its petrogenesis and geological significance, and further constraining the closure timing of the Mongolia-Okhotsk Ocean in the southern Xing’an Block. The study shows that the intrusive rocks include two types of rock: granite porphyry and diorite porphyrite, with crystallization ages of (167.0±0.5) Ma and (160.0±0.7) Ma, respectively, indicating that they are products of Middle to Late Jurassic magmatic activities. Two rocks belong to the high-K calc-alkaline I-type series, characterized by Na2O contents ranging from 4.57％ to 4.97％ and 3.21％ to 3.98％, and weak aluminum saturation with A/CNK ratios ranging from 1.00 to 1.07 and 0.93 to 1.10. They also have characteristics of enrichment in large ion lithophile elements (Rb, Th and K), depletion in high field-strength elements (Ta, Nb, P and Ti), moderate rare earth element contents (ΣREE) of (90.5~153.1)×10-6 and (111.6~128.8)×10-6, significant fractionation between light and heavy rare earth elements with LREE/HREE ratios of 6.74~10.26 and 5.14~8.84, (La/Yb)N of 5.61~9.58 and 4.92~10.38, and middle negative Eu anomalies (δEu) ranging from 0.58 to 0.68 and 0.83 to 1.02. These results can be inferred that the petrogenesis of the intrusive rocks is likely related to the closure of the Mongolia-Okhotsk Ocean, and they formed in a tectonic background of crustal thickening collapse or detachment, during the transition from compression to extension tectonics.

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备注/Memo

备注/Memo:
收稿日期:2022-11-18;改回日期:2023-02-10。
基金项目:中国地质调查局"1∶5万勃洛浑迪等4幅区调(编号:1212010781033)"和自然资源部"我国典型地区大气水-地表水-地下水资源综合评估与水平衡研究——以滹滏平原为例(编号:B201905)"项目联合资助。
作者简介:王志强,1990年生,男,工程师,本科,主要从事矿产勘查工作。Email:452154588@qq.com。
通讯作者:王丽娟,1981年生,女,高级工程师,硕士,主要从事地球化学研究工作。Email:282665774@qq.com。
更新日期/Last Update: 1900-01-01