江西金山金矿床及成因探讨

金山金矿床位于著名的赣东北有色金属和贵金属成矿带的中段，来格受北东向金山大型韧性剪切带和中元古界双桥山群浅变质岩系的控制。通过野外调查和室内稀土元素、铅同位素、氢氧同位素和流体包裹体成分等项目测试研究，证实金山矿床属雪峰－加里东期形成的变质热液矿床，而不是燕山期岩浆热液矿床。     

Porphyry and Skarn Cu-Mo-Pb-Zn-Ag-Au Metallogeny of the Gangdise Plutonic-Volcanic Arc, Tibet

PORPHYRY AND SKARN Cu-Mo-Pb-Zn-Ag-Au METALLOGENY OF THE GANGDISE PLUTONIC -VOLCANIC ARC, TIBETtheNational973Project“MetallogenicBackgroundandProspectiveEvaluationoftheGangdiseBelt”     

祁连造山带地球物理场特征和区域控矿

本文利用1：100万区域重力、构造航磁、大地电磁测深和地震测深等地球物理资料,研究了祁连造山带区域构造、深部构造和区域控矿作用;祁连山造山带与周边具有不同地球物理场特征是划分构造单元的依据,在内部基底断裂构造具有南北分带,东西分块的特征。深部构造处在地壳厚度变异带边缘。并要考虑构造演化对成矿控制的阶段性。     

The role of collisional tectonics in the metallogeny of the Central Andean tin belt

The Inner Arc of the Central Andes, broadly corresponding to the Eastern Cordillera, is the location of a rich Tertiary and Triassic Sn–W–(Ag-base metal) metallogenic province, commonly referred to as the Bolivian tin belt. We propose that the Tertiary metallogeny, which generated most of the tin ores, was a direct consequence of discrete “collisions” between the South American plate and the Nazca slab and sub-slab mantle, during the ongoing Andean orogeny. Evidence supporting this proposal include: (1) the coincidence of the tin province and the Inner Arc in a marked “hump” in the Andean orogen, which may represent tectonic indentation; (2) the symmetry of the tin province with respect to the Bolivian orocline, the axis of which corresponds to the direction of highest compression; (3) the relative symmetry of the magmatism and tin mineralization with respect to this axis; (4) the concurrent timing of mineralization and compressional pulses; (5) the similar host rock geochemistry and ore lead isotope data, testifying to a common crustal reservoir; and (6) the striking similarity of the igneous suites, associated with the ore deposits to those from “typical” collisional orogens. A number of studies have called upon a persistent tin anomaly to explain the metallogeny of the region. We propose, instead, that the latter is better explained by periodic compressional interaction between the Farallon/Nazca oceanic plate and the South American continent. This led to the generation of peraluminous magmas, which during fractional crystallization exsolved the fluids responsible for the voluminous Sn–W mineralization.     

Tectonic implications of the geochemical data from the Makran igneous rocks in Iran

Makran is one of the largest accretionary prisms on Earth, formed by the closure of the Neotethys ocean which is now represented by its remnant, the Gulf of Oman. Tectonic evolution of the Makran island‐arc system is explored within the context of a north dipping subduction zone, with temporal variations in slab dip arrangement. In a Middle Jurassic–Early Paleocene steep slab dip arrangement, the Mesozoic magmatic arc and the Proto‐Jaz Murian depression, which was an intra‐arc extensional basin, were developed. This was associated with development of outer‐arc ophiolitic mélange and oceanward migration of the Bajgan–Durkan continental sliver, which is the continuation of the Sanandaj–Sirjan zone of the Zagros orogenic belt into the Makran region. In a Late Paleocene to Late Pliocene moderate to shallow slab dip arrangement, compression and tectonic inversion of the Proto‐Jaz Murian extensional basin into the Jaz Murian compressive basin was associated with the uplift of the southern part of the Jaz Murian Depression along the South Jaz Murian Fault, and emplacement of the Paleogene–Neogene magmatic arc, behind the Jaz Murian compressive basin. A shallow slab dip arrangement in the Quaternary led to the emplacement of a third magmatic arc inland, over the southern part of the Yazd–Tabas–Lut micro‐continental block. It is envisioned that the Makran island‐arc system will pass through similar tectonic events in the future, as the Zagros island‐arc system did in the past. However, a future remnant and/or residual basin similar to the present Gulf of Oman will continue to survive to the east.     

广西铜矿地质特征及找矿方向探讨

本文根据广西铜矿地盾普查勘探资料和科研成果进行了较系统研究和总结,将广西铜矿床划分为矽卡岩型、热液脉型、铜镍型和砂岩型等四个成因类型,侧重对两个主要类型(矽卡岩型、热液脉型)铜矿床的主要成矿地质特征进行概括归纳,并论述其典型矿床实例。初步分析铜矿床成矿条件,进一步探讨找矿方向,提出了具体找矿意见。     

镇安二台子金矿控矿规律研究与盲矿体预测

在总结二台子金矿成矿规律的基础上,采用信息量和特征分析方法对矿区及外围进行了综合预测.之后,运用地球化学与构造应力分析相结合方法,对已知矿体进行了深部预测并定位.     

四川石棉县大水沟碲矿床地质与成因

四川石棉大水沟碲矿是我国发现的世界首例独立磅矿床，并具Ｔｅ、Ｂｉ、Ｓｅ、Ａｕ、Ａｇ多元素矿化。通过对该矿床的地质特征、矿石学与流体包裹体、同位素地球化学进行分析研究后，指出该矿床受韧性－脆性剪切带构造岩片和隐伏花岗岩底辟热穹隆的双重控制，以中下三叠统动热变质大理岩－绿片岩－千枚岩组合地层为赋矿围岩，热液蚀变发育碳酸盐化、硅化等。流体包裹体和稳定同位素地球化学研究表明，流体属低氧逸度、高二氧化碳逸度，深成中温热液成矿作用，物质来源于地壳深部，后期受大气降水影响。Ｋ－Ａｒ法测年与铅同位素两阶段模式年龄一致，成矿时代属燕山早期（１４４．２－１５０Ｍａ），与区域分布的花岗岩关系密切。     

Paleozoic Tectono-Metallogeny in the Tianshan-Altay Region, Central Asia

The research on Paleozoic tectonics and endogenic metallogeny in the Tianshan-Altay region of Central Asia is an important and significant project. The Altay region, as a collision zone of the Early Paleozoic(500–397 Ma), and the Tianshan region, as a collision zone of the early period in the Late Paleozoic(Late Devonian-Early Carboniferous, 385–323 Ma), are all the result of nearly N-S trending shortening and collision(according to recent magnetic orientation). In the Late Devonian-Early Carboniferous period(385–323 Ma), regional NW trending faults displayed features of dextral strike-slip motion in the Altay and Junggar regions. In the Tianshan region, nearly EW-trending regional faults are motions of the thrusts. However, in the Late Carboniferous-Early Permian period(323–260 Ma), influenced by the long-distance effect induced from the Ural collision zone, those areas suffered weaker eastward compression, the existing NW trending faults converted into sinistral strike-slip in the Altay and Junggar regions, and the existing nearly E-W trending faults transferred into dextral strike-slip faults in the Tianshan region. The Rocks of those regions in the Late Carboniferous-Early Permian period(323–260 Ma) were moderately ruptured to a certain tension-shear, and thus formed a number of world famous giant endogenic metal ore deposits in the Tianshan-Altay region. As to the Central Asian continent, the most powerful collision period may not coincide with the most favorable endogenic metallogenic period. It should be treated to "the orogenic metallogeny hypothesis" with caution in that region.     

青藏高原碰撞造山带成矿作用：构造背景、时空分布和主要类型

大陆成矿作用是当代区域成矿学研究的重大前沿,增进对大陆碰撞造山带成矿作用的理解和认识是孕育和建立大陆成矿理论框架的核心和关键。长期以来,由于对系统完整地记录大陆碰撞过程的典型造山带的成矿作用缺乏深入系统的研究,对碰撞造山过程及壳/幔相互作用与成矿作用的耦合关系和成因联系缺乏深刻的理解,导致了对碰撞成矿阶段以及各阶段动力学过程认识不清,引发了较多争议。青藏高原造山带,成矿规模大、形成时代新、矿床类型多、保存条件好,为系统地研究大陆成矿作用、解决上述存在的问题提供了天然实验室。“印度-亚洲主碰撞带成矿作用”973项目组通过对青藏高原碰撞造山带成矿作用历时3年的系统研究,建立了青藏高原重要成矿事件的时空坐标,初步建立了成矿作用的地球动力学模型或构造控制模型,提出了一套完整的大陆碰撞带成矿理论新框架,包括三大成矿作用和12种矿床类型:同碰撞造山成矿作用(65-41 Ma,4种矿床类型),晚碰撞转换成矿作用 (40-26Ma,4种矿床类型),后碰撞伸展成矿作用(25-0 Ma,4种矿床类型)。其主控因素分别为:碰撞造山背景、壳源岩浆活动和大规模剪切变形;陆内转换背景、幔源岩浆活动和大规模走滑-推覆-剪切作用;后碰撞伸展环境、壳/幔岩浆作用和热液对流系统。