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首页> 外文会议>PACRIM Congress >The Kharmagtai Porphyry Breccia Complex - Characteristics of Early Carboniferous Porphyry Mineralisation in the Gurvansaikhan Belt, Southern Mongolia
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The Kharmagtai Porphyry Breccia Complex - Characteristics of Early Carboniferous Porphyry Mineralisation in the Gurvansaikhan Belt, Southern Mongolia

机译：Kharmagtai Porphyry Breccia复杂 - 蒙古南部古尔夫朝圣海滩皮带早期石炭系斑岩矿化特征

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The Middle Palaeozoic Gurvansaikhan Belt (Southern Mongolia) of the Central Asian Orogenic Belt is one of Central Asia's most significant emerging porphyry copper provinces. The belt has become the focus of extensive exploration for porphyry copper-gold deposits over the last decade following the discovery of the giant Oyu Tolgoi porphyry copper-gold deposit. The Gurvansaikhan Belt is known to host porphyry deposits of Late Devonian (~370 Ma) and Early Carboniferous (~320 Ma) age. The characteristics of Early Carboniferous porphyry systems are poorly known compared to their older counterparts, despite their probable abundance and potential economic significance. Exploration within the Kharmagtai porphyry breccia complex has identified multiple cogenetic gold-copper-porphyry centres and late-stage mineralised magmatic-hydrothermal tourmaline breccias emplacement within a composite high-K calc-alkaline quartz monzodiorite intrusive complex. Early porphyry alteration and mineralisation at Kharmagtai are zoned around vertically attenuated early-and inter-mineral quartz monzodiorite dykes and stocks and comprises a complex sequence of calc-potassic, potassic and propylitic assemblages. Hematite dusting is a common alteration product that gives intrusions and the host rocks a distinctive pink-orange colour. Several of the systems have bornite-rich cores, where mineralisation is characterised by high gold grades (0.7 to >5 g/t Au) that zone outward to chalcopyrite-rich and then outer pyritic halos. Early stockwork mineralisation is overprinted by magmatic-hydrothermal tourmaline breccias. High-grade magmatic-hydrothermal tourmaline breccias form part of a major copper-gold mineralised breccia system with significant exploration potential. The Early Carboniferous porphyry copper-gold systems of the Gurvansaikhan Belt represent a substantial exploration challenge in an area of increasing exploration maturity. This paper summarises the characteristics of the Kharmagtai porphyry system that have helped to define the Early Carboniferous porphyry province of the Gurvansaikhan Belt and discusses implications for future exploration.
机译：中亚古古朝向的中间古古山脉（南蒙古）是中亚造山带的是中亚最重要的新兴斑岩省份之一。在发现巨型Oyu Tolgoi斑岩铜金矿床之后，腰带已成为过去十年广泛探索的重点。 Gurvansaikhan皮带是已知的晚杜松子（〜370 mA）和早期石炭系（〜320 mA）的斑岩沉积物。尽管有可能的丰富和潜在的经济意义，早期碳酸斑纹斑岩系统的特性众所周知。 Kharmagtai Porphyry Breccia Complex的探索已经确定了多种型镀金 - 铜斑岩中心和后期矿化岩浆水热陀螺胶片Breccias在复合高k钙碱石英Monzodiorite侵入式复合物中脱位。在Kharmagtai的早期斑纹改变和矿化在垂直减弱的早期和矿物间石英莫西曲霉染料和股票周围被分区，并包含复杂的钙咖啡术序列。赤铁矿粉尘是一种常见的改变产品，其侵入侵入和主持人岩石是一种独特的粉红色橙色。其中一些系统具有丰富的富有核心，其中矿化的特征在于，高金级（0.7至> 5g / t au），向外区域富含含氯石和外部的卤素卤体。早期的库存矿化是由岩浆 - 水热乒乓球菌Breccias叠印。高档岩浆 - 热热陀螺BERECCIAS形成一部分具有显着勘探潜力的主要铜金矿化Breccia系统。 Gurvansaikhan皮带的早期碳酸斑岩铜金系统在增加勘探成熟度的范围内代表了大量勘探挑战。本文总结了Kharmagtai斑岩系统的特点，该系统有助于定义Gurvansaikhan皮带的早期石炭系斑岩省，并探讨了未来勘探的影响。

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