Amalgamation of South China into Rodinia during the Grenvillian accretionary orogeny: Geochemical evidence from Early Neoproterozoic igneous rocks in the northern margin of the South China Block

Wu Peng; Zhang Shao-Bing; Zheng Yong-Fei; Fu Bin; Liang Ting

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Amalgamation of South China into Rodinia during the Grenvillian accretionary orogeny: Geochemical evidence from Early Neoproterozoic igneous rocks in the northern margin of the South China Block

机译：在Grenvillian orgenery期间，南方融入罗西尼亚的胺化：来自南部北边缘的新蛋白质沸石火岩的地球化学证据

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In order to gain insights into the amalgamation process of South China into Rodinia, a combined study of whole rock geochemistry, zircon U-Pb ages and Hf-O isotopes was carried out for igneous rocks from the Mianlue ophiolite in the northern margin of the South China Block. In-situ zircon U-Pb dating yields Pb-206/U-238 ages of 905 +/- 8 Ma for plagiogranite, 936 +/- 6 Ma for andesite and 950 +/- 5 Ma for gabbro-diorite. The plagiogranite is characterized by high Na2O contents of 6.6-7.0 wt%, low TiO2 contents of 0.2-0.4 wt%, and enrichment in LREE and LILE but depletion in Nb, Ta and Ti. The zircons have positive epsilon(Hf)(t) values of 8.9 to 14.9 and slightly elevated 8180 values of 4.6 to 6.8%o. The whole-rock yields low (Sr-87/Sr-86), ratios of 0.7016-0.7031, positive epsilon(Nd)(t) values of 5.9 to 6.9 and positive epsilon(Hf)(t) values of 11.1 to 11.2. This indicates that the plagiogranite was produced by partial melting of juvenile oceanic crust that experienced seawater-hydrothermal alteration. The age of 905 +/- 8 Ma for the plagiogranite marks the obduction of the ophiolite on continental margin during Rodinia assembly. The andesite and gabbro-diorite are enriched in LILE and LREE but depleted in HFSE. The andesite shows highly positive zircon epsilon(Ht)) values of 8.6 to 15.8 and mantle-like zircon delta O-18 values of 4.1 to 5.9%o. In addition, both andesite and gabbro-diorite whole-rocks are depleted in Sr-Nd-Hf isotopes, with positive epsilon(Nd)(t) values of 4.1 to 5.5 and highly positive epsilon(Hf)(t)values of 12.1 to 16.0. Such geochemical characteristics indicate that these mafic igneous rocks were derived from partial melting of arc-type mantle sources. In this regard, the ages of 936 +/- 6 Ma and 950 +/- 5 Ma for the andesite and gabbro-diorite date mafic arc magmatism above a Grenvillian oceanic subduction zone. Taken altogether, the subduction of the Grenvillian oceanic crust was continuous till the obduction of ophiolite at similar to 900

机译：为了深入了解南方的甘露岛的融合过程，对整个岩石地球化学，锆石U-PB年龄和HF-O同位素的组合研究是针对南部北边缘的棉花蒙皮矿石的火成岩中国街区。原位锆石U-PB可约会Pb-206 / U-238岁的斑块Pb-206 / U-238岁，用于沉淀物，936 +/- 6 mA为Andesite，950 +/- 5 mA用于Gabbro-Diorite。巯基钛矿的特征在于6.6-7.0wt％的高Na 2 O含量，低TiO 2含量为0.2-0.4重量％，嗜血和含有浓缩，但在Nb，Ta和Ti中耗尽。氧化锆具有8.9至14.9的ε（HF）（T）值，略微升高8180值4.6至6.8％O。全岩产量低（SR-87 / SR-86），比率为0.7016-0.7031，阳性ε（nd）（t）值5.9至6.9，阳性ε（hf）（t）值为11.1-11.2。这表明通过少年海壳的部分熔化产生了沉淀物，这些植物经历了海水 - 水热改变。普拉替金属岩的905 +/- 8 mA的年龄标志着Ophinia大会在大陆边缘的内容。安德莱特和加布 - 二矿石富含乳渣，嗜睡，但在HFSE中耗尽。亚矿石显示出高度阳性锆石ε（HT）值为8.6至15.8和搭式锆石δO-18值，4.1-5.9％O.此外，Andesite和Gabbro-Diorite全岩在SR-ND-HF同位素中耗尽，阳性ε（Nd）（T）值为4.1至5.5，高阳性ε（HF）（T）值为12.1至16.0。这种地球化学特性表明，这些镁发泡岩石源自弧型搭配源的部分熔化。在这方面，在Grenvillian海洋俯冲区上方的胚胎和朱波罗·狄罗伊州和戈布罗 - 迪尔蒂特日期MAFIC ARC Magmatism的936 +/- 6 mA和950 +/- 5 mA。完全拍摄，格伦西亚海洋地壳的俯冲是连续的，直到相似的眼镜沸石采用类似于900

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来源
《Precambrian Research》 |2019年第2019期|共23页
作者
Wu Peng; Zhang Shao-Bing; Zheng Yong-Fei; Fu Bin; Liang Ting;
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作者单位

Univ Sci &

Technol China Sch Earth &

Space Sci CAS Key Lab Crust Mantle Mat &

Environm Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Sch Earth &

Space Sci CAS Key Lab Crust Mantle Mat &

Environm Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Sch Earth &

Space Sci CAS Key Lab Crust Mantle Mat &

Environm Hefei 230026 Anhui Peoples R China;

Australian Natl Univ Res Sch Earth Sci Canberra ACT 2601 Australia;

Univ Sci &

Technol China Sch Earth &

Space Sci CAS Key Lab Crust Mantle Mat &

Environm Hefei 230026 Anhui Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类前寒武纪;
关键词
South China; Rodinia; Grenvillian subduction; Ophiolite; Supercontinent assembly;

机译：南方;罗尼菊;格伦西亚郊区;眼科;超张集的装配;

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机译：在Grenvillian orgenery期间，南方融入罗西尼亚的胺化：来自南部北边缘的新蛋白质沸石火岩的地球化学证据
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Amalgamation of South China into Rodinia during the Grenvillian accretionary orogeny: Geochemical evidence from Early Neoproterozoic igneous rocks in the northern margin of the South China Block

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