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Late Paleozoic potassic igneous rocks of the Kensu and Dzholkolot plutons in the eastern Kyrgyz Tien Shan: Petrology, geochemistry, U-Pb zircon geochronology, and related skarn-porphyry W-Mo-Cu-Au mineralization
Gondwana Research ( IF 7.2 ) Pub Date : 2024-06-21 , DOI: 10.1016/j.gr.2024.06.003
Serguei G. Soloviev , Sergey G. Kryazhev , Dina V. Semenova , Yury A. Kalinin , Nikolay S. Bortnikov

The Kensu and Dzholkolot multiphase intrusions are situated in the eastern part of the “Main Structural Line of Tien Shan”, or the “Nikolaev Line”. The plutons comprise mafic to intermediate (monzogabbro, monzonite, syenite, quartz syenite) and silicic (quartz monzonite, monzogranite, and leucogranite-alaskite) members, together with the interim (camptonite) and final monzodiorite-porphyry dikes. Geochemical signatures of the igneous rocks correspond to high-K calc-alkaline to shoshonitic series intrusions, with a strong A-type affinity, emplaced in post-collisional setting. Magmatic evolution included a generation of shoshonitic magma by a low-degree partial melting of the metasomatically-enriched upper mantle, followed by amphibole fractionation in a deep (lower crustal?) magma chamber. This was followed by a generation of mantle-induced granitic magmas in a crustal protolith, with possible mixing/mingling of various magmas. The rocks crystallized at shallow levels, in an oxidized environment, under decreasing pressure and temperature toward the younger (granitic) intrusion phases.

中文翻译:


吉尔吉斯天山东部Kensu和Dzholkolot岩体的晚古生代钾火成岩:岩石学、地球化学、U-Pb锆石年代学以及相关的矽卡岩-斑岩W-Mo-Cu-Au矿化



Kensu和Dzholkolot多期侵入体位于“天山主要构造线”或“尼古拉耶夫线”的东部。岩体包括镁铁质到中间岩体(二长辉长岩、二长岩、正长岩、石英正长岩)和硅质岩体(石英二长岩、二长花岗岩和淡色花岗岩-阿拉长岩),以及中间岩脉(斜长岩)和最终二长闪长岩-斑岩岩脉。火成岩的地球化学特征对应于高 K 钙碱性至钾玄岩系列侵入体,具有强 A 型亲和力,位于碰撞后环境中。岩浆演化包括通过交代富集的上地幔的低度部分熔融产生肖肖岩岩浆,然后在深层(下地壳?)岩浆室中进行角闪石分馏。随后在地壳原岩中产生了地幔诱发的花岗岩岩浆,并可能混合/混合各种岩浆。岩石在氧化环境中、在压力和温度降低的情况下在浅层结晶,朝向较年轻的(花岗岩)侵入阶段。
更新日期:2024-06-21
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