The Cretaceous tectonic event in the Qiangtang Basin and its implications for hydrocarbon accumulation

The tectonic event during Cretaceous and its relationship with hydrocarbon accumulation in the Qiangtang Basin is discussed based on zircon U-Pb dating and the study of deformation, thermochronology and hydrocarbon formation. LA-ICPMS zircon U-Pb dating indicates that the tectonic event took place during the Early-Late Cretaceous （125-75Ma）. The event not only established the framework and the styles of structural traps in the basin, but also led to the cessation of the first hydrocarbon formation and the destruction of previous oil pools. The light crude oil in the basin was formed during the second hydrocarbon formation stage in the Cenozoic, and ancient structural traps formed during the Cretaceous event are promising targets for oil and gas exploration.

湖北省地质勘查行业形势分析

2010年以来,湖北省地质勘查行业规模不断壮大,资质数量逐年增长,非油气地质勘查投入持续下降,探矿权数量持续减少。地质勘查趋势呈现出针对矿业的地质勘探工作将持续削减,地质勘查工作进入新常态但仍将继续调整,生态文明建设深入推进,地质调查评价工作热度不减等方面特征。建议:(1)积极探索"PPP"模式,拓宽地质找矿投融资渠道;(2)推进地质找矿供给侧结构性改革,不断拓展地勘工作新领域;(3)转变矿产勘查方式,逐步提高绿色勘查水平。

鄂北七尖峰岩体LA-ICP-MS锆石U-Pb测年及其岩石成因、成矿意义

鄂北七尖峰岩体由外带斑状黑云二长花岗岩、中带含斑黑云二长花岗岩、内带黑云二长花岗岩组成,具有由外而内幕式侵位的特点。通过对七尖峰岩体南端中粒斑状黑云二长花岗岩LA-ICP-MS锆石U-Pb测年,获得加权平均年龄为(141±0.98)Ma(MSWD=2.6),为七尖峰岩体提供精确的同位素年代学依据。通过分析对比桐柏—大别地区中生代侵入岩时代、背景及其与成矿作用的关系,认为:七尖峰岩体为~141 Ma加厚地壳熔融形成的埃达克质岩浆侵位而成,而岩体分带的特点为同一岩浆房不同期次幕式侵位的结果;岩体侵位可能是导致环七尖峰岩体众多矿床形成的关键因素,在成矿过程中,岩体的主要贡献是提供热源、动力,并在一定程度上提供成矿物质。

扬子地台西缘天井坝铅锌矿地质特征及找矿前景

天井坝铅锌矿位于扬子地台西缘,为川滇黔南北向铅锌成矿带北段新发现的中型铅锌矿床。根据最新的矿床勘查成果,详细分析矿床成矿地质条件及矿床地质特征,认为铅锌矿受地层和构造双重控制,矿床成因类型为沉积—改造型,该类型铅锌矿床是扬子地台西缘铅锌矿聚区中最具找矿潜力的矿床类型。

湖北省矿产资源勘查开发功能区构建与评价

构建矿产资源勘查开发功能区有利于加强和优化矿产资源勘查、开发、保护和管控。以湖北省17个市(州、区)为评价单元,选取17种重要矿产开展全省矿产资源勘查开发功能区划。以资源安全、生态安全和经济社会安全为具体目标,以资源基础、开发条件、生态条件、区域发展需求为准则条件构建指标体系,识别出接替区、优化区、保障区、补给区和匮乏区等5类功能区,并对各功能区进行评价,为全省矿产资源总体规划和布局提供基础支撑。