diopside skarn or epidote skarn--> tremolite skarn (coarse-grained tremolite) and coarse-grained tremolite --> fine-grained tremolite. Tremolite was mainly formed in prograde metamorphism stage. The mineralization of regional metamorphic nephrite is closely related to regional metamorphism rather than magmatic activity, the ore-forming fluid is mainly meteoric water (such as Chunchuan, South Korea). The ore forming fluid of metamorphic hydrothermal nephrite is mainly meta-moiphic water, and the ore-forming materials Mg and Ca come from marble, Si and H2O may come from the siliceous hydrothermal solution formed by regional metamorphism and mixed magmatism (such as Xiuyan in Liaoning Province). Nephrite mainly occurs in the areas with strong tectonic activity and sections with strong contact alteration zone between intrusive rocks and carbonate rocks. The primary maible-related nephrite deposit can be explored according to mineralization mark, tectonic mark, wall rock alteration mark, secondary deposit mark, ancient mines mark, etc. [ABSTRACT FROM AUTHOR]
| Abstract (Chinese): |
和田玉在中国有着悠久的开采和使用历史, 在中国的玉石文化中占有重要地位。根据产状,大理岩型和田 玉的成因类型可分为接触交代型（矽卡岩型/岩浆热液型）、区域变质和变质热液型, 其中接触交代型最重要也是优 质和田玉的主要成因类型。根据围岩的年龄、和田玉中错石或云母测年得到的矿带形成年龄以及区域地理位置, 可 将中国大理岩型和田玉划分为西昆仑矿带的新疆（形成年龄上限为450- 350 Ma）、东昆仑矿带的青海省格尔木（形 成年龄为300- 240 Ma）、东北地区（河磨玉约250-150 Ma,老玉约1 700 Ma）、西南地区、中南地区（火山岩约682土 62 Ma,辉绿岩约260 Ma）和华东地区等6个矿带, 本文主要总结了这6个矿带大理岩型和田玉矿床的地质产状、矿 物组成、全岩主微量元素持征、成矿流体组成、错石/云母年龄及空间分布和成矿规律。和田玉的主要矿物为透闪 石。接触交代型和田玉的成矿流体主要由岩浆水、大气降水和围岩白云石大理岩脱碳产生的CO：以不同比例混合 组成, 成矿物质Mg和Ca来自白云石大理岩,Si和H20来自岩浆热液（如新疆和田矿带）O和田玉的形成主要经历 了接触变质和变质交代阶段、早期进变质阶段和晚期退变质阶段, 交代过程为白云石大理岩-> 透辉石矽卡岩或绿帘 石矽卡岩一> 透闪石矽卡岩（粗粒透闪石）和粗粒透闪石-细粒透闪石,透闪石主要形成于迸变质阶段;区域变质型和 田玉的成矿作用与区域变质作用密切相关, 而不依赖岩浆活动, 成矿流体主要为大气降水（如韩国春川）;变质热液 型和田玉成矿流体主要为变质水, 成矿物质Mg和Ca来自大理岩,Si和HjO可能来自区域变质作用和混合岩浆作用而 形成富硅质的热水溶液（如辽宁岫岩）。和田玉主要产于构造活动强烈的地区、侵入岩与碳酸盐岩接触蚀变带较强烈 的地段, 可根据矿化标志、构造标志、围岩蚀变标志、子料和山流水溯源、古矿洞标志等探寻原生大理岩型和田玉矿床。 [ABSTRACT FROM AUTHOR] |
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| Autor: |
景云涛, 刘 琰, 张 勇, 买托乎提, 阿不都瓦衣提 |
| Zdroj: |
Acta Petrologica et Mineralogica / Yanshi Kuangwuxue Zazhi; May2022, Vol. 41 Issue 3, p651-667, 17p |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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