地质与资源2026，Vol.35Issue(1)：12-26,15.DOI:10.13686/j.cnki.dzyzy.2026.01.002
胶西北上庄岩体岩石成因探讨
Petrogenesis of the Shangzhuang pluton in northwestern Jiaodong:Evidence from petrography,geochemistry,geochronology,and Sr-Nd isotopic compositions
摘要
Abstract
The extensive gold mineralization in the Northwest Jiaodong metallogenic concentration area is genetically related with Mesozoic magmatism,particularly with the Early Cretaceous magmatic activity.This study presents an integrated analysis of the Early Cretaceous Shangzhuang pluton,involving petrography,whole-rock geochemistry,zircon U-Pb dating by LA-MC-ICP-MS,and Sr-Nd isotopic investigations.Results show that the rare earth element(REE)patterns of Shangzhuang pluton are similar to those of adakitic rocks,indicating its typical adakitic affinity.Sr-Nd isotopic analyses yield 87Sr/86Sr value of 0.711932,143Nd/144Nd of 0.511654,initial(87Sr/86Sr)i of 0.511577,εNd(t)of-13.57,and a two-stage depleted mantle model age(TDM2)of 2 960 Ma.Zircon U-Pb dating constrains the emplacement age of the pluton to 128.7±0.29 Ma.Based on these data,it is proposed that during the early Early Cretaceous,the subduction and followed retracement of Pacific Plate induced upwelling of mantle-derived magmas,which provided a sustained heat source,triggering dehydration and partial melting of mafic lower crustal rocks to generate acidic-intermediate magmas.These magmas then mixed with contemporaneous acidic melts produced by partial melting of the Precambrian basement under similar thermal conditions.The hybrid magma then ascended along extensional strike-slip faults and underwent assimilation and contamination by upper crustal Linglong-type granites during its ascent.Ultimately,it was emplaced at favorable structural settings to form Shangzhuang pluton.关键词
侵入岩体/埃达克岩/岩石成因/锆石U-Pb年龄/Sr-Nd同位素/山东省Key words
intrusive rock/adakite/petrogenesis/zircon U-Pb age/Sr-Nd isotope/Shandong Province分类
天文与地球科学引用本文复制引用
迟乃杰,王秀凤,张晨西,邹双英,高华丽,牛志力,申颖,徐珺..胶西北上庄岩体岩石成因探讨[J].地质与资源,2026,35(1):12-26,15.基金项目
国家自然科学基金"招平断裂带北段3千米超深部控矿构造格架与成矿机理"(42172094),"华北板块东部寒武纪晚期SPICE事件的古海洋演化及机制研究"(42272122) （42172094）
国家重点实验室基金项目"基于深反射地震约束的胶莱盆地东北缘金矿区岩浆-成矿耦合性研究"(2024-LAMD-K01) （2024-LAMD-K01）
省部级重点实验室开放课题"焦家金矿区3千米超深钻的黄铁矿标型特征与纵深变化规律研究及地质意义"(kfkt201810). （kfkt201810）
