辽西杨家杖子侵入岩地球化学和年代学特征及其与成矿的关系

doi:10.13278/j.cnki.jjuese.201503113

摘要/Abstract

摘要：

辽西杨家杖子地区位于华北板块北缘,燕山褶皱带东段。该区侵入岩主要有4种类型:中粗粒钾长花岗岩、斑状钾长花岗岩、似斑状钾长花岗岩和细粒角闪二长岩。其中:主体岩石为中粗粒钾长花岗岩、斑状钾长花岗岩和似斑状钾长花岗岩,均呈较大的岩基出露,沿北东向展布,锆石U-Pb同位素测年结果显示其形成于早侏罗世(181~188 Ma);细粒角闪二长岩多呈岩墙或岩脉产出,近南北向展布,锆石U-Pb同位素测年结果显示其形成于晚三叠世(227 Ma左右)。岩石地球化学分析结果显示:斑状钾长花岗岩和似斑状钾长花岗岩属于弱过铝质高钾钙碱性系列岩石;细粒角闪二长岩属于准铝质高钾钙碱性系列岩石。斑状钾长花岗岩和似斑状钾长花岗岩富集高场强元素Th、La、Nd、Hf和Gd,亏损高场强元素Ti、Ho和大离子亲石元素Ba、Sr;细粒角闪二长岩富集高场强元素Gd、Er和大离子亲石元素Ba、Sr,亏损高场强元素Nb、Hf、Ti、Pr、Y、Yb。稀土配分模式图均为右倾型,轻稀土元素分馏明显,重稀土元素分馏不明显。研究表明该区中生代岩浆作用主要发生在早侏罗世,且与著名的杨家杖子钼矿有着密切的成因联系,而晚三叠世岩浆作用相对较弱。

关键词: 辽西, 杨家杖子, 侵入岩, 地球化学, 年代学, 杨家杖子钼矿

Abstract:

Yangjiazhangzi area in the Western Liaoning Province (Liaoxi) is located in the east section of Yanshan fold belt which is in the north rim of the North China craton. There are four main types of intrusive rocks in this area: medium-coarse grain moyites, porphyritic moyite, porphyaceous, and fine-grained hornblende monzonite. The main rock is porphyritic moyite and porphyaceous moyite,which appear as large batholiths,and distribute along the north-east. Zircon U-Pb isotope dating shows its emplacement mainly in 181-188 Ma. Fine-grained hornblende monzonite presents as a stock, and distribute along the north-south. Zircon U-Pb isotope dating shows its emplacement mainly in 227 Ma. Petrogeochemistry analysis results indicate that porphyritic moyite and porphyaceous moyite belong to weak peraluminous high k calc alkaline rock series. The fine-grained hornblende monzonite belongs to metaluminous high k calc alkaline rock series. Porphyritic moyite and porphyaceous moyite are rich in high field strength elements Th, La, Nd, Hf and Gd, and depleted of high field strength elements Ti, Ho and large ion lithophile elements Ba, Sr; fine-grained hornblende monzonite is rich in high field strength elements Gd, Er and large ion lithophile elements Ba, Sr, and depleted of high field strength elements Nb, Hf, Ti, Pr, Y, Yb. The chondrite-normalized REE patterns show that all the three rocks belong to the right slope type, the LREE fractionation is obvious, and the HREE fractionation is insignificant. Researches show that Mesozoic magmatism in this region mainly occurred in Early Jurassic, and had close genetic relation with the famous Yangjiazhangzi molybdenum deposits, but the Late Triassic magmatism was relatively weak.

Key words: Liaoxi, Yangjiazhangzi, intrusive rocks, geochemistry, chronology, Yangjiazhangzi molybdenum deposits

中图分类号:

P588.1

徐学纯, 张行行, 郑常青, 崔芳华, 高源, 高峰. 辽西杨家杖子侵入岩地球化学和年代学特征及其与成矿的关系[J]. 吉林大学学报(地球科学版), 2015, 45(3): 804-819.

Xu Xuechun, Zhang Xingxing, Zheng Changqing, Cui Fanghua, Gao Yuan, Gao Feng. Geochemistry and Chronology Characteristics of the Intrusive Rocks and Its Relationship with Mineralization in Yangjiazhangzi Area, the Western Liaoning Province[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(3): 804-819.

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