Decoding multiple tectonothermal events in zircons from single rock samples: SHRIMP zircon U–Pb data from the late Neoarchean rocks of Daqingshan, North China Craton
Decoding multiple tectonothermal events in zircons from single rock samples: SHRIMP zircon U–Pb data from the late Neoarchean rocks of Daqingshan, North China Craton
复制标题
从单个岩石样品中解码锆石中的多个构造热事件：华北克拉通大青山新太古代晚期岩石的SHRIMP锆石U-Pb数据
DOI：
10.1016/j.gr.2012.02.020
复制
发表时间：
2012-11
影响因子：
6.1
通讯作者：
Mingzhu Ma, Yusheng Wan, M. Santosh , Zhongyuan X
中科院分区：
文献类型：
--
作者：
Mingzhu Ma, Yusheng Wan, M. Santosh , Zhongyuan X
一系列复杂的构造热事件形成了中国克拉通北部新太古代-古元古代地壳演化。本文对内蒙古缝合带孔兹岩带大青山哈德门沟地区的一套变质岩进行了系统的SHRIMP锆石U-Pb研究。分析了桑干群的两个变质火山岩和新太古代晚期至古元古代早期的四个变质火成岩中的锆石。这些岩石中的锆石表现出典型的核-缘或核-幔-缘结构。残留的岩浆锆石记录了约2.5Ga的结晶年龄，随后出现了不同的铅损失，显示了康科迪亚地区高达2.1Ga的年龄范围。锆石的重结晶区域呈扇形分带，或由内部暗区和外部浅区组成。杂草丛生的地幔是均匀的。重结晶锆石和浮生地幔在~2.5~~2.1Ga的协和面上显示出相似的年龄分布。褶皱边缘发育程度较低，但其年龄(1.96-1.84Ga)与古元古代晚期“上乌拉山亚群”变质锆石以及本区前人报道的紫苏花岗岩和超高温麻粒岩的年龄相似。侵入桑干“群”和超深闪长质片麻岩的变质正长花岗岩含有1.95Ga岩浆和1.85Ga变质锆石。新太古代晚期-古元古代早期变质火山岩的岩浆锆石εHf(T)为1.2~7.0，TDM1(Hf)模式年龄为2 687~2 532 Ma，TDM2(CC)(Hf)模式年龄为2 837~2 559 Ma。重结晶锆石和地幔域的Hf同位素组成与岩浆域相似。我们的研究是该地区首次从NCC单一岩石样品中的锆石中识别出从新太古代晚期到古元古代早期到晚期的多个构造热事件。所有岩石单元普遍追踪到的晚古元古代变质作用的强烈叠加，表明这些岩石参与了与NCC最终融合有关的构造热事件。
A complex sequence of tectonothermal events shaped the Neoarchean–Paleoproterozoic crustal evolution in the North China Craton (NCC). Here we present a systematic SHRIMP zircon U–Pb investigation on a suite of metamorphic rocks from the Hademengou area of Daqingshan within the Khondalite Belt of the Inner Mongolia Suture Zone. We analyzed zircons from two meta-volcanic rocks of the Sanggan “Group” and four meta-igneous rocks of late Neoarchean to early Paleoproterozoic. Zircons from these rocks display typical core–rim or core–mantle–rim structures. The relict magmatic zircons record crystallization ages of ca. 2.5Ga followed by variable Pb loss, showing a range of ages in the concordia up to 2.1Ga. The recrystallized domains of zircons show sector zoning or are composed of inner dark domains, and outer lighter domains. The overgrowth mantles are homogeneous. The recrystallized zircons and overgrowth mantles show similar age data distribution along a concordia from ~2.5 to ~2.1Ga. The overgrowth rims are poorly developed but record ages (1.96–1.84Ga) similar to those displayed by metamorphic zircons in the late Paleoproterozoic “Upper Wulashan Subgroup” as well as the charnockites and UHT granulites reported in previous studies from this region. A meta-syenogranite intruding the Sanggan “Group” and Hypersthene dioritic gneiss contains 1.95Ga magmatic and 1.85Ga metamorphic zircons. Magmatic zircons of the late Neoarchean–early Paleoproterozoic metavolcanic rocks have εHf(t) of 1.2 to 7.0, tDM1(Hf) model ages of 2687 to 2532Ma and tDM2(CC)(Hf) model ages of 2837 to 2559Ma. The recrystallized zircons and mantle domains display Hf isotope composition similar to that of the magmatic domains. Our study is the first report from this region that identifies multiple tectonothermal events ranging from late Neoarchean through early to late Paleoproterozoic from zircons within single rock samples in the NCC. A strong overprint of late Paleoproterozoic metamorphism traced commonly in all the rock units indicates that these rocks were involved in the tectonothermal event associated with the final amalgamation of the NCC.
登录
查看更多内容
影响因子：
8.9
作者：
Y. Wan;Dunyi Liu;C. Dong;Shoujie Liu;Shijin Wang;Enxiu Yang
通讯作者：
Y. Wan;Dunyi Liu;C. Dong;Shoujie Liu;Shijin Wang;Enxiu Yang
DOI：
--
发表时间：
2005
期刊：
Journal of Jiling University
影响因子：
--
作者：
Xu Zhongyuan;Liu Zheng-hong;Huang Feng-xiang;Yang Zhensheng
通讯作者：
Xu Zhongyuan;Liu Zheng-hong;Huang Feng-xiang;Yang Zhensheng
影响因子：
3.4
作者：
Chu, NC;Taylor, RN;Burton, K
通讯作者：
Burton, K
影响因子：
3.9
作者：
R. Flowers;A. Schmitt;M. Grove
通讯作者：
R. Flowers;A. Schmitt;M. Grove
影响因子：
3.8
作者：
M. Santosh
通讯作者：
M. Santosh