Genesis and Significance of Late Cretaceous Granitic Magmatism in Xianghualing Tin–Polymetallic Orefield, Nanling Region, South China

Typical stratiform-like cassiterite–sulfide orebodies formed at 160–150 Ma cut by a steep hydrothermal vein-type orebody were discovered in the Xianghualing tin–polymetallic orefield, which implied a new phase of magmatism and mineralization later than the Late Jurassic stage. Hence, a systematic st...

Full description

Saved in:
Bibliographic Details
Published inApplied sciences Vol. 12; no. 18; p. 8984
Main Authors Zhang, Zhihui, Hu, Bojie, Zhang, Da, He, Xiaolong, Zou, Jianlin, Tian, Xufeng, Yi, Yuanshun
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.09.2022
Subjects
A2-type granite
Ablation
Age
Cassiterite
Cretaceous
Fault lines
Geochemistry
Geology
Granite
Isotopes
Jurassic
Laboratories
Laohuya granite
Lasers
Late Cretaceous magmatism
Mineralization
Radiometric dating
Sediments
Subduction (geology)
Tectonics
Trace elements
Xianghualing tin–polymetallic orefield
Zinc
Zircon
Beijing China
China
Online AccessGet full text

Cover

More Information
Summary:Typical stratiform-like cassiterite–sulfide orebodies formed at 160–150 Ma cut by a steep hydrothermal vein-type orebody were discovered in the Xianghualing tin–polymetallic orefield, which implied a new phase of magmatism and mineralization later than the Late Jurassic stage. Hence, a systematic study of the characteristics and genesis of the concealed Laohuya granite, including U–Pb age, trace elements, Lu–Hf isotopes of zircons, and whole-rock major- and trace-elements, is examined in this paper. The zircon U–Pb dating yielded a Concordia age of 87.75 ± 1 Ma, confirming the existence of Late Cretaceous magmatism in the Xianghualing tin–polymetallic orefield. The Laohuya granite is classified as syenogranite and belongs to the peraluminous, high K calc-alkaline series. It is a highly evolved A2-type granite with εHf(t) values ranging from −14.97 to −7.59 and two-stage model ages (TDM2) ranging from 2939 to 2280 Ma. Combining chronology, petrochemistry, isotopic geochemistry, and previous tectonic studies, we believe that the Laohuya granite originated from the partial melting of a reworked ancient crust composed of TTGs, and its weathered sediments formed in subduction or collision zones at 2.5 Ga, controlled by the reactivation of the Chenzhou–Linwu deep fault in the extensional setting of South China during the Late Cretaceous.
ISSN:2076-3417
2076-3417
DOI:10.3390/app12188984