江苏张集地区基性—超基性煌斑岩矿物学地球化学研究特征及地质意义

Mineralogical Geochemical Characteristics and Geological Significance of Basic—ultrabasic Rocks in Zhangji Area in Jiangsu Province

摘要:

本文分析了江苏张集地区基性—超基性岩地质剖面岩石的岩矿鉴定、金刚石指示矿物的特征及基性—超基性岩主量元素、微量元素、稀土元素，认为该区的煌斑岩来源于经历了交代富集作用的地慢源区。煌斑岩岩浆演化过程中遭受了一定程度的地壳混染和分离结晶作用，在快速拉张的环境下，作为寄主岩石，煌斑岩岩浆沿构造薄弱地带侵入金刚石，至地壳浅部隐爆形成。张集地区的基性—超基性煌斑岩具有一定的金刚石找矿远景。

Abstract:

Through analysis and study on rock and mineral identification, characteristics of diamond indicator minerals and major elements, trace elements, and rare earth elements of basic—ultrabasic rocks in Zhangji area in Jiangsu province,iIt isindicated that the porphyries in this area originate from magmatic environments in the mantle or even deeper regions, and are located in a slow source area that has undergone metasomatism enrichment and can form diamond depths. During the evolution of porphyry magma, it has undergone a certain degree of crustal contamination and fractional crystallization. In the environment of rapid tension within the plate, as the host rock, porphyry magma intrudes diamonds along the weak structural zone into the shallow crust to form hidden explosions. The rocks that produce diamonds in Zhangji area are basic—ultrabasic porphyry rocks. It has which have further diamond exploration prospects.