华南东国泰区块古新生代花岗岩的印支期无性生殖现象

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Island Arc Pub Date : 2024-01-19 DOI:10.1111/iar.12510
Wei Zhang, Hanwen Zhou, Xiaohua Zhou, Xilin Zhao, Huan Liu, Yang Jiang, Chunzhong Li
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引用次数: 0

摘要

东中国地块存在花岗岩变质作用和地壳异常,但花岗岩面部分熔融的确切时间及其与造山运动的联系尚未得到很好的解释。在本研究中,我们对东中国海地块浙江西南部八都组的大浙片麻岩和带状伟晶岩进行了岩石学、全岩石地球化学、锆石U-Pb定年、微量元素和Hf同位素分析。这些熔体是由生物岩脱水产生的,如生物岩+石英+斜长石=正长石+K长石+熔体和生物岩+石英+斜长石+矽线石=石榴石+K长石+熔体。这些岩石中的锆石显示出清晰的岩心-岩缘结构,其岩缘和岩心的一致年龄分别为 233 Ma 和 1.83 Ga。锆石边缘表明熔体,而锆石核心则表明大泽片麻状花岗岩和带状辉长岩的原岩是从演化岩浆中结晶出来的。锆石岩心和岩缘的εHf(t)=-2.2 ~ -6.3和εHf(t)=-22.8 ~ -32.4分别为负值,表明存在新元古代成分。虽然片麻状花岗岩和带状闪长岩的主要元素组成略有不同,但痕量元素蛛网图和REE模式显示两者相似,进而发现原岩为A型花岗闪长岩/闪长岩。结合已发表的资料,我们认为大柘片麻状花岗岩和带状闪长岩是在233Ma时由花岗岩面局部熔融形成的,它是在东国泰地块与一个未知陆块之间的碰撞造山运动的地壳缩短和增厚的作用下形成的,其构造线呈NNE走向。大泽片麻岩和带状辉长岩的原岩(花岗或花岗闪长岩)在1.83 Ga时由东长春地块的新元古代成分再加工结晶而成。早新生代(1912-1819Ma)的碰撞造山运动和后期的板块内断裂阶段与哥伦比亚超大陆的聚集和分裂相对应。
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Indosinian anatexis of Paleoproterozoic granites in the east Cathaysia Block, South China

Granulite facies metamorphism and crustal anatexis exist in the East Cathaysia Block, the exact timing of granulite facies partial melting and its link with orogenesis have not been well constrained. In this study, we carried out petrography, whole rock geochemistry, and zircon U–Pb dating, trace elements and Hf isotopes analyses on Dazhe gneissic granite and banded migmatite from the Badu Group in southwest Zhejiang province in the East Cathaysia Block. The melts were produced through the dehydration of biotite, such as biotite + quartz + plagioclase = orthopyroxene + K-feldspar + melt and biotite + quartz + plagioclase + sillimanite = garnet + K-feldspar + melt. Zircons from these rocks show clear core-rim structure and yield rim and core concordant ages at 233 Ma and 1.83 Ga, respectively. The zircon rims suggesting the melts and the cores are suggesting the protolith of Dazhe gneissic granite and banded migmatite were crystallized from an evolving magma. The zircon cores and rims have negative εHf(t) = −2.2 ~ −6.3 and εHf(t) = −22.8 ~ −32.4, and they give suggestion of the presence of Neoarchean components. Although the major-element compositions of the gneissic granite and banded migmatite are slightly different, the trace-element spider diagram and REE pattern show they are similar, and then we find that the protoliths are A-type granodiorite/diorite. Combined with the published data, we suggested that the Dazhe gneissic granite and banded migmatite were formed through granulite facies partial melting at 233 Ma, which was promoted by crustal shortening and thickening of the collision orogeny between East Cathaysia Block and an unknown terrane with a NNE trend structure line. The protoliths (granite or granodiorite) of Dazhe gneissic granite and banded migmatite crystallized at 1.83 Ga by reworking of the Neoarchean components of East Cathaysia Block. The Paleoproterozoic (1912–1819 Ma) collisional orogeny and the later intraplate rifting stage are corresponding to the aggregation and breakup of the Columbia supercontinent.

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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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