华北东部克拉通兴城晚侏罗世花岗岩中石榴石的矿物学特征及其岩浆演化意义

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2024-04-22 DOI:10.1134/S0869591124020085
Shiyao Gao, Zhongjie Xu, Fufeng Zhao, Ke Cao, Nanyu Tang
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摘要

华北克拉通东部广泛发育着一系列与古太平洋板块俯冲有关的中生代花岗岩。这些花岗岩中含有石榴石这一次要物相。石榴石记录了岩浆成分、温度和压力等重要信息,是研究花岗岩岩石学演化的重要对象。我们以辽宁兴城晚侏罗世含石榴石的单斜花岗岩为研究对象,通过岩浆石榴石腰带的原位元素地球化学变化和拉曼效应,探讨了研究区的岩浆演化过程。研究发现,石榴石具有从核心到边缘MnO和CaO含量先增加后减少,FeO和MgO含量先减少后增加的带状结构。通过模拟石榴石和黑云母的结晶顺序,发现石榴石呈 "M "型 "菱形钟状剖面",Mn/(Ca+Mg+Fe)值和Mn/Fe值,反映了岩浆中矿物的结晶模式是由黑云母结晶到石榴石结晶为主。认为同一石榴石中可能存在正向腰带和反向腰带;岩浆演化后期矿物的分离和结晶是石榴石成分剖面变化的主要原因。这与侏罗纪晚期以后华北克拉通东北部花岗岩岩浆演化的晚期特征是一致的。
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Mineralogical Characteristics and Magmatic Evolution Significance of Garnets in the Late Jurassic Granites in Xingcheng, Eastern North China Craton

A series of Mesozoic granites related to the subduction of the ancient Pacific plate are widely developed in the eastern part of the North China Craton. These granites contain garnet as a minor phase. Garnet records important information such as magma composition, temperature and pressure, and is an important object in the study of petrological evolution of granites. We take the late Jurassic garnet–bearing monzogranite in Xingcheng, Liaoning as the research object, and the magmatic evolution process in the study area is discussed by the in–situ element geochemical variation and the Raman effect of magmatic garnet girdle. It is found that the garnet has a zonation structure in which the contents of MnO and CaO increase and then decrease, while the contents of FeO and MgO decrease and then increase from the core to the edge. Through the simulation of the crystallization sequence of garnet and biotite, it is found that the garnet has “M” type “spessartine bell–shaped profile”, Mn/(Ca + Mg + Fe) value and Mn/Fe value, which reflects that the crystallization pattern of minerals in the magma is dominated by biotite crystallization to garnet crystallization. It is considered that forward and reverse girdle can exist in the same garnet; the separation and crystallization of minerals in the late magmatic evolution is the main reason for the change in the compositional profile of the garnet. This is consistent with the late evolution of granitic magmas in the northeastern of the North China Craton after the late Jurassic.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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