Aleksandr S Stepanov, Jovid Aminov, Sharifjon Odinaev, Farukh Sh Iskandarov, Shao-Yong Jiang, Nikolai S Karmanov
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引用次数: 0
摘要
以萤石为主的岩石偶尔会与碳酸盐岩伴生,但它们之间的地质学和岩石学关系却鲜有报道。塔吉克斯坦东南部帕米尔山脉的敦克尔代克地区含有由方解石、萤石、天青石-重晶石、硫化物、磷灰石以及少量石英、生物岩和稀土元素-氟碳酸盐组成的独特岩石尖峰。尖晶石与主(元)沉积岩有尖锐的接触,并呈带状分层,从含萤石的方解石碳酸盐岩到萤石岩(含>50%萤石的岩石)不等。萤石的特征是高 Ca、F、Ba、Sr、REE 和 S 以及异常低的 O。地质关系和纹理表明,这些岩峰起源于接近方解石-萤石共晶的熔体,在岩峰结晶过程中经历了成核控制的分化,并在较大的侵入体中形成了萤石积层。Dunkeldyk岩钉表明,以萤石为主的岩石的大型地质体可能是由碱性硅酸盐岩浆分异产生的碳酸盐-氟化物熔体形成的。
Fluoritites produced by crystallization of carbonate-fluoride magma
Fluorite-dominated rocks are occasionally found in association with carbonatites, but their geologic and petrologic relations are rarely reported. The Dunkeldyk area of the Pamir mountains in south-eastern Tajikistan contains dikes of distinctive rocks composed of calcite, fluorite, celestine-barite, sulfides, apatite, with minor quartz, biotite, and REE-fluorcarbonates. The dikes have sharp contacts with the host (meta-)sedimentary rocks and layering with ribbons, ranging from fluorite-bearing calcite carbonatites to fluoritites (rocks with >50% fluorite). The fluoritites are characterised by high Ca, F, Ba, Sr, REE and S coupled with anomalously low O. The geologic relations and textures suggest a magmatic origin of the dikes from melts close to calcite-fluorite eutectic that experienced nucleation-controlled differentiation during the crystallization of dikes and the formation of fluoritite cumulates in larger intrusions. The Dunkeldyk dikes demonstrate that sizable geological bodies of fluorite-dominated rocks could form from carbonate-fluoride melts originating by differentiation of alkaline silicate magmas.
期刊介绍:
The Journal of Petrology provides an international forum for the publication of high quality research in the broad field of igneous and metamorphic petrology and petrogenesis. Papers published cover a vast range of topics in areas such as major element, trace element and isotope geochemistry and geochronology applied to petrogenesis; experimental petrology; processes of magma generation, differentiation and emplacement; quantitative studies of rock-forming minerals and their paragenesis; regional studies of igneous and meta morphic rocks which contribute to the solution of fundamental petrological problems; theoretical modelling of petrogenetic processes.