首页|Geochronology,Geochemistry,and Sr-Nd-Hf Isotopes of the Diorite Porphyrites from the Weining Beishan Area,Ningxia Hui Autonomous Region:Constraints on Their Source and Tectonic Implications

Geochronology,Geochemistry,and Sr-Nd-Hf Isotopes of the Diorite Porphyrites from the Weining Beishan Area,Ningxia Hui Autonomous Region:Constraints on Their Source and Tectonic Implications

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The Weining Beishan area of Ningxia Hui Autonomous Region is located at on the west-ern edge of the Helanshan tectonic belt,which is a tectonic joint among Alxa Block,Ordos Block,and North Qilian orogenic belt.However,the tectonic evolution of this area remains unclear due to the lack of magmatic information.This paper conducted researches on geochronology,geochemistry,and Sr-Nd-Hf isotopes of the diorite porphyrites exposed in the Weining Beishan area.The zircon U-Pb dating yields two ages of 145.0±1.1 and 146.2±1.5 Ma,and the whole-rock geochemical data indicate that the diorite porphyrites are metaluminous to weakly peraluminous and high-K calc-alkaline series.The characteristics of highly initial 87Sr/86Sr ratios(0.70816 to 0.71047),negative εNd(t)(-8.9 to-8.4),and negative εHf(t)(-13.8 to-21.2)indicate that the diorite porphyrites originated from partial melting of the middle-lower ancient crust related to the North China Craton.Combined with the regional geology,we suggested that partial melting was triggered by a tectonic activity of deep faults cutting through the crust under the regional stress transformation from compressing to extension during the Late Jurassic-Early Cretaceous,which is probably related to the westward subduction of the Paleo-Pacific Plate.

zircon U-Pb datingSr-Nd-Hf isotopesmagma sourcediorite porphyriteWeining Beishan areaNingxia Hui Autonomous Regiongeochronologygeochemistry

Anlu Liu、Lianfu Hai、Jinke Liu、Xiaojun Zhang、Haifeng Li、Fengshun Zhao、Guoliang Zhao、Jinhe Bai

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Yifu Museum,China University of Geosciences,Wuhan 430074,China

School of Earth Resources,China University of Geosciences,Wuhan 430074,China

Mineral Geological Survey Institute of Ningxia Hui Autonomous Region,Yinchuan 750021,China

National Demonstration Center for Experimental Mineral Exploration Education,China University of Geosciences,Wuhan 430074,China

Coal Geological Survey Institute of Ningxia Hui Autonomous Region,Yinchuan 750021,China

Zhuhai Engineering Investigation Institute of Guangdong Province,Zhuhai 519000,China

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2024

10.1007/s12583-021-1491-2

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(2)
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