气候变化领域集成服务门户(CCPortal): Petrogenesis and Tectonic Setting of the Baluogenguole Mafic Dykes, Zongwulong Belt: Implications for Evolution of the Northern East Paleo-Tethys Ocean

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DOI	10.3390/min14050473
	Petrogenesis and Tectonic Setting of the Baluogenguole Mafic Dykes, Zongwulong Belt: Implications for Evolution of the Northern East Paleo-Tethys Ocean
	Chen, Min; Pan, Tong; Zhao, Wen-Tao; Wang, Yan-He; Xue, Chun-Ji; Wang, Bing-Zhang; Xia, Chu-Lin
发表日期	2024
EISSN	2075-163X
起始页码	14
结束页码	5
卷号	14 期号:5
英文摘要	The late Paleozoic tectonic setting of the Zongwulong Belt (ZWLB), a significant unit located in the northern Qaidam margin, Qinghai province, remains uncertain. Diabase dykes in the western part of the Zongwulong Belt offer insights into this issue. Field investigations reveal that the dips of the dykes are almost vertical, and they have sharp boundaries with the host rocks. These dykes consist of plagioclase, clinopyroxene, and opaque minerals exhibiting a characteristic porphyritic texture and massive structure. Zircon U-Pb dating of the dykes yields a weighted 206Pb/238U age of 289 +/- 1 Ma. The dykes exhibit relatively high concentrations of TFeO, K2O + Na2O, and TiO2, while the SiO2 and MgO concentrations are relatively low. They display relative light-over-heavy REE enrichment, and lack negative Nb-Ta and Eu anomalies. The dykes underwent negligible crustal contamination, and experienced extensive fractional crystallization of olivine, clinopyroxene, and Fe-Ti oxides. Originating from the spinel-garnet transition zone at depths of approximately 75 km, the dykes result from garnet facies low-degree melting (5%-10%) in a continental rift setting. Combining these findings with regional geological data, we propose that the ZWLB likely experienced a continental rift in the west and exhibited a narrow oceanic environment in the east in the late Paleozoic period, potentially representing the most distant north branch of the East Paleo-Tethys Ocean.
英文关键词	Baluogenguole mafic dykes; geochemistry; late Paleozoic; East Paleo-Tethys Ocean; Zongwulong Belt
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS类目	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:001231620300001
来源期刊	MINERALS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/298705
作者单位	Qinghai University; China Geological Survey
推荐引用方式 GB/T 7714	Chen, Min,Pan, Tong,Zhao, Wen-Tao,et al. Petrogenesis and Tectonic Setting of the Baluogenguole Mafic Dykes, Zongwulong Belt: Implications for Evolution of the Northern East Paleo-Tethys Ocean[J],2024,14(5).
APA	Chen, Min.,Pan, Tong.,Zhao, Wen-Tao.,Wang, Yan-He.,Xue, Chun-Ji.,...&Xia, Chu-Lin.(2024).Petrogenesis and Tectonic Setting of the Baluogenguole Mafic Dykes, Zongwulong Belt: Implications for Evolution of the Northern East Paleo-Tethys Ocean.MINERALS,14(5).
MLA	Chen, Min,et al."Petrogenesis and Tectonic Setting of the Baluogenguole Mafic Dykes, Zongwulong Belt: Implications for Evolution of the Northern East Paleo-Tethys Ocean".MINERALS 14.5(2024).