Permian volcanisms in eastern and southeastern margins of the Jiamusi Massif, northeastern China: zircon U-Pb chronology, geochemistry and its tectonic implications
Permian volcanisms in eastern and southeastern margins of the Jiamusi Massif, northeastern China: zircon U-Pb chronology, geochemistry and its tectonic implications
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佳木斯地块东缘和东南缘二叠纪火山活动：锆石U-Pb年代学、地球化学及其构造意义
DOI：
10.1007/s11434-008-0164-1
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发表时间：
2008-04
期刊：
影响因子：
--
通讯作者：
Xu WenLiang
中科院分区：
文献类型：
--
作者：
Zhang XingZhou;Yang DeBin;Yu Yang;Meng En;Pei FuPing;Xu WenLiang
通过对佳木斯地块东缘和东南缘晚古生代火山岩的LA-ICP-MS锆石U-Pb定年和地球化学资料的分析，探讨了区域构造演化。8个代表性火山岩的锆石均为自形-半自形，具条带状吸收和细尺度振荡生长环带，Th/U比值较高（0.33-2.37），显示岩浆成因。测年结果表明，研究区晚古生代火山岩可分为两期，早二叠世（206 Pb/238 U加权平均年龄为288 Ma）和中二叠世火山作用（206 Pb/238 U加权平均年龄为268 Ma）。前者主要由玄武岩、玄武安山岩、安山岩和少量英安岩组成。它们具有SiO2含量低、Mg#高（0.40-0.59）、富集Na（Na 2 O/K2 O = 1.26-4.25）和轻稀土元素（LREE）、相对亏损重稀土元素（HREE）和高场强元素（HFSE）的特征，表明佳木斯地块东缘早二叠世可能存在活动大陆边缘环境。后者主要由流纹岩和少量英安岩组成，高SiO2（77.23%~ 77.52%），低MgO（0.11%~ 0.14%），富K2 O（Na 2 O/K2 O < 0.80）和Rb、Th、U，贫Eu、Sr、P、Ti，属壳源成因。因此，提出中二叠世火山岩可能是在佳木斯和兴卡地块碰撞作用下形成的。
LA-ICP-MS zircon U-Pb dating and geochemical data for the Late Paleozoic volcanic rocks from eastern and southeastern margins of the Jiamusi Massif are presented to understand the regional tectonic evolution. Zircons from eight representative volcanic rocks are euhedral-subhedral in shape and display striped absorption and fine-scale oscillatory growth zoning as well as high Th/U ratios (0.33–2.37), implying a magmatic origin. The dating results show that the Late Paleozoic volcanic rocks in the study area can be divided into two stages, i.e., the Early Permian (a weighted mean206Pb/238U age of 288 Ma) and the Middle Permian volcanisms (a weighted mean206Pb/238U age of 268 Ma). The former is composed mainly of basalt, basaltic-andesite, andesite and minor dacite. They are characterized by low SiO2contents, high Mg#(0.40–0.59), enrichment in Na (Na2O/K2O = 1.26–4.25) and light rare earth elements (LREEs), relative depletion in heavy rare earth elements (HREEs) and high field strength elements (HFSEs), indicating that an active continental margin setting could exist in the eastern margin of the Jiamusi Massif in the Early Permian. The latter consists mainly of rhyolite and minor dacite with high SiO2(77.23%–77.52%), low MgO (0.11%–0.14%), enrichment in K2O (Na2O/K2O ratios < 0.80) and Rb, Th, U and depletion in Eu, Sr, P and Ti, implying a crust-derived origin. Therefore, it is proposed that the Middle Permian volcanic rocks could have formed under the collision of the Jiamusi and the Khanka Massifs.
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影响因子：
1.8
作者：
Wu Fu
通讯作者：
Wu Fu
影响因子：
1.5
作者：
Fu-Yuan Wu;Jin-Hui Yang;C. Lo;S. Wilde;Dejun Sun;B. Jahn
通讯作者：
Fu-Yuan Wu;Jin-Hui Yang;C. Lo;S. Wilde;Dejun Sun;B. Jahn
DOI：
--
发表时间：
1996
期刊：
--
影响因子：
--
作者：
A. Yin;T. Harrison
通讯作者：
A. Yin;T. Harrison
影响因子：
1.5
作者：
Yanbin Zhang;Fu-Yuan Wu;S. Wilde;M. Zhai;Xiaoping Lu;Deyou Sun
通讯作者：
Yanbin Zhang;Fu-Yuan Wu;S. Wilde;M. Zhai;Xiaoping Lu;Deyou Sun
DOI：
--
发表时间：
2001
期刊：
--
影响因子：
--
作者：
Wu Fu
通讯作者：
Wu Fu