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Geochronology of the diorite porphyrites in Ning-Wu basin and their metallogenic significances

journal contribution
posted on 2023-05-17, 05:09 authored by Fan, Y, Zhou, TF, Yuan, F, Lejun ZhangLejun Zhang, Qian, B, Ma, L, David CookeDavid Cooke
Ning-Wu basin is the important parts of the Middle-Lower Yangtze River Valley metallogenic belt, where there are widespread porphyry-like type ( magnetite-apatite type) iron deposits. However, the researches on precise ore-forming and magmatic activity epoch and tectonic setting are very weak. Based on detailed field geological work, we carried out systematic geochronological study of diorite porphyrite plutons related to porphyry-like type iron deposits in the basin. LA-ICP-MS zircon U-Pb dating for seven diorite porphyrite plutons such as Washan, Taocun, Heshangqiao, Dongshan, Baixiangshan, Hemushan and Gushan intrusions, has been carried out. LA-ICP-MS zircon U-Pb dating yield the ages of 130.2 ± 2.O Ma, 130.7 ± 1.8 Ma, 131.1 ± 1.5 Ma, 131.1 ± 3.1 Ma, 130.0 ± 1.4 Ma, 131.1 ± 1.9 Ma and 129.2 ± 1.7 Ma for intrusions respectively. The dating result indicates that different diorite porphyrite plutons in Ning-Wu volcanic basin are all formed in the early stage of Early Cretaceous about 130Ma, which can nearly represent the metallogenetic epoch of the porphyry-like type iron deposits. There are three periods (145-136 Ma, 135-127 Ma, 126-123 Ma) of ore-forming and magmatic activity in the Middle-Lower Yangtze River Valley metallogenic belt. The diorite porphyrite plutons in Ning-Wu basin were the products of the second period magmatic activity and obviously later than the high-k calc-alkaline intrusions related to skarn-porphyry Cu-Au deposits in uplift areas in the Middle-Lower Yangtze River Valley metallogenic belt. The diorite porphyrite plutons in Ning-Wu volcanic basin were thought to be formed under regional lithospheric and thinning environment.

History

Publication title

Yanshi Xuebao (Acta Petrologica Sinica)

Volume

26

Issue

9

Pagination

2715-2728

ISSN

1000-0569

Department/School

School of Natural Sciences

Publisher

Science China Press

Place of publication

16 Donghuangchenggen North St, Beijing, Peoples R China, 100717

Repository Status

  • Restricted

Socio-economic Objectives

Copper ore exploration

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