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首页> 外文期刊>Contributions to Mineralogy and Petrology >A new jadeltlte jade locality (Sierra del Convento, Cuba): first report and some penological and archeologlcal Implications
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A new jadeltlte jade locality (Sierra del Convento, Cuba): first report and some penological and archeologlcal Implications

机译：一个新的翡翠玉器产地（古巴塞拉利昂科文托）：第一份报告以及一些考古学和考古学意义

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摘要

A new jadeitite jade locality has been discovered in the serpentinite-matrix subduction melange of the Sierra del Convento (eastern Cuba) in a context associated with tectonic blocks of garnet-epidote amphibolite, tona-litic-trondhjemitic epidote gneiss, and blueschist. The mineral assemblages of jadeitite jade and jadeite rocks are varied and include combinations of jadeite, omphacite, albite, paragonite, analcime, clinozoisite-epidote, apatite, phlogopite, phengite, chlorite, glaucophane, titanite, rutile, zircon, and quartz formed during various stages in their P-T evolution. Field relationships are obscure, but some samples made almost exclusively of jadeite show evidence of crystallization from fluid in veins. In one of these samples studied in detail jadeite shows complex textural and chemical characteristics (including oscillatory zoning) that denote growth in a changing chemical medium. It is proposed that interaction of an Al-Na rich fluid with ultramafic rocks produced Al-Na-Mg-Ca fluids of varying composition. Episodic infiltration of these fluids, as a result of episodic opening of the veins, developed oscillatory zoning by direct precipitation from fluid and after reaction of fluid with pre-existing jadeite. The latest infiltrating fluids were richer in Mg-Ca, favouring the formation of omphacite and Mg-Ca rich jadeite in open voids and the replacement of earlier jadeite by fine-grained omphacite + jadeite at 550-560 DEGC. This new occurrence of jadeite in Cuba opens important perspectives for archeo-logical studies of pre-Columbian jade artifacts in the Caribbean region.
机译：在塞拉·德尔·考文托（古巴东部）的蛇纹岩-基质俯冲混杂岩中发现了一种新的翡翠玉，其背景与石榴石-埃皮科特闪石，托纳-特里特-特德吉米奇的片麻片岩和blueschist的构造块有关。翡翠玉和翡翠岩石的矿物组合是多种多样的，并且包括在各种过程中形成的翡翠，绿辉石，钠长石，方钠石，方钠石，斜长石-埃辉石，磷灰石，金云母，锂铁矿，绿泥石，绿泥石，葡光石，钛矿，金红石，锆石和石英PT发展的各个阶段。场的关系是模糊的，但是一些几乎完全由翡翠制成的样品显示出从静脉流体中结晶出来的证据。在其中一项详细研究的样品中，翡翠显示出复杂的组织和化学特征（包括振荡分区），表明在不断变化的化学介质中生长。有人提出，富铝酸钠流体与超镁铁质岩石的相互作用产生了不同组成的铝钠镁镁钙流体。这些流体的阵发性渗透，是由于静脉的阵发性开放，通过从流体中直接沉淀以及在流体与先前存在的翡翠反应之后形成的振荡带。最新的渗透流体富含Mg-Ca，有利于在空洞中形成绿辉石和富Mg-Ca的翡翠，并在550-560 DEGC下用细粒绿辉石+翡翠代替较早的翡翠。古巴新出现的翡翠为加勒比地区哥伦布时期以前的玉器考古研究提供了重要的视角。

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