|Table of Contents|

Geochronology, Geochemistry and Petrogenesis of Late Cretaceous Hornblende Gabbros and Quartz Diorites in Chabala Area of Tibet, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2022年第01期
Page:
42-64
Research Field:
基础地质与矿床地质
Publishing date:

Info

Title:
Geochronology, Geochemistry and Petrogenesis of Late Cretaceous Hornblende Gabbros and Quartz Diorites in Chabala Area of Tibet, China
Author(s):
LYU Na LANG Xing-hai* WANG Xu-hui HE Qing DENG Yu-lin YANG Tong-shan DONG Mi
(College of Earth Science, Chengdu University of Technology, Chengdu 610059, Sichuan, China)
Keywords:
hornblende gabbro quartz diorite geochemistry petrogenesis Late Cretaceous ridge subduction Lhasa terrane
PACS:
P581; P597
DOI:
10.19814/j.jese.2021.10046
Abstract:
The petrogenesis and geodynamic mechanism of Late Cretaceous magmatic rocks in southern Lhasa terrane, Tibet, are still controversial. The hornblende gabbros and quartz diorites in the west of Chabala area, Qushui county of southern Lhasa terrane were selected as the research object, and based on field geological surveys, the petrography, geochemistry and LA-ICP-MS zircon U-Pb geochronology were analyzed to identify the formation ages and petrogenesis of hornblende gabbros and quartz diorites, and further constrain the tectonic evolution of southern Lhasa terrane during Late Cretaceous. The results show that the hornblende gabbros emplace at 91-87 Ma, and the quartz diorites emplace at 81 Ma. The hornblende gabbros have low contents of SiO2(48.16%-51.05%), high contents of MgO(4.54%-11.13%), Co((31.2-46.8)×10-6)and Ni((1.79-82.70)×10-6), and(87Sr/86Sr)i value is 0.703 925-0.704 380, εNd(t)value is 2.50-3.96, indicating that the hornblende gabbros are generated by partial melting of a depleted mantle wedge that have been metasomatized by slab-derived fluid, and suffer from no obvious crustal contamination. The quartz diorites are generally high SiO2(62.45%-62.90%), Al2O3(15.94%-16.22%), K2O+Na2O(6.36%-6.46%)and Mg# value(43.77-44.65), thus can be grouped into quasi-aluminous I-type granite. The quartz diorites are generated by partial melting of the lower crust and mix with a little mantle-derived magma. Both rocks show the characteristics of arc magma with enrichment of LREEs and LILEs(such as Rb, Th, U and Sr), and depletion of HREEs and HFSEs(such as Nb, Ta and Ti). Integrating regional data, the “flare-up” event in southern Lhasa terrane during the early Late Cretaceous(100-80 Ma)is likely the result of the northwards subduction of an oceanic ridge of Neo-Tethys. The ridge subduction would have resulted asthenosphere material upwelling through a slab window and decompression melting to form a basic magma, which provides heat to cause partial melting of the mantle wedge and lower crustal rocks, resulting in the magma eruption during the early Late Cretaceous of southern Lhasa terrane.

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Last Update: 2022-02-25