Constraints of in-situ elemental and B isotopic compositions of tourmaline on the origin of the Nong Sua Sn deposit, Thailand

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Jie-Hua Yang, Rui-Zhong Hu, Liang Liu, Wei Mao, Ya-Zhou Fu, Mei-Fu Zhou, Heng Chen, Alongkot Fanka, Ke-Jun Hou
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Abstract

The Nong Sua Sn deposit in Thailand is a typical vein-type deposit with three generations of tourmaline (Tur I, II and III). Tur I as disseminations (Tur Ia) or nodules (Tur Ib) in the pegmatite-aplite stock crystallized from the late-magmatic stage. Tur II coexists with quartz in a complex vein system within the stock and is of magmatic-hydrothermal origin. Tur III occurs in cassiterite-tourmaline veins within contact zones between the quartz-tourmaline vein and metasedimentary country rocks (Tur IIIa) or as smaller cassiterite-tourmaline veinlets (Tur IIIb). Both Tur I and Tur II have similar trends in chemical composition with δ11B values from -15.1 ‰ to -11.5 ‰ and from -15.8 ‰ to -11.7 ‰, respectively, which can be explained by a Rayleigh isotope fractionation. The similarity suggests a common magmatic-hydrothermal system from which tourmaline crystallized. Tur III has lower Sn concentrations (22 to 143 ppm) and higher Fe3+/(Fe2+ + Fe3+) ratios than Tur I, Tur II, and thus crystallized under more oxidized conditions. Tur III has relatively high δ11B values from -13.3 ‰ to -10.6 ‰ with corresponding δ11Bfluid values from -9.1‰ to -6.4‰ for Tur III and from -14.0 ‰ to -9.0 ‰ for Tur I and Tur II. Thus, oxidizing modified meteoric water with relatively high δ11B values was added to the magmatic-hydrothermal system from which the deposit formed. Precipitation of cassiterite was likely caused by the change of redox state related to fluid mixing. Our study provides new important insights about the evolution of hydrothermal fluids from the pre-ore stages to ore genesis of Sn deposits. Such an evolution of the magmatic-hydrothermal system may be a common process for Sn deposits in the Southeast Tin Province (SEAT) and elsewhere.

电气石原位元素和B同位素组成对泰国Nong Sua锡矿床成因的制约
泰国Nong Sua锡矿床是一个典型的脉状矿床,具有3代电气石(Tur I, II和III), Tur I是岩浆晚期晶化的伟晶岩-长晶岩中的展布状(Tur Ia)或结核状(Tur Ib)。图二与石英共存于岩体内的复杂脉系中,为岩浆-热液成因。图ⅲ产于石英-电气石脉与变质沉积岩(图ⅲia)接触带内的锡石-电气石脉中,或较小的锡石-电气石脉(图ⅲib)中。图1和图2的δ11B值变化趋势相似,δ11B值分别为-15.1‰~ -11.5‰和-15.8‰~ -11.7‰,可以用瑞利同位素分馏来解释。这种相似性表明电气石是在一个共同的岩浆-热液系统中结晶的。与Tur I和Tur II相比,Tur III具有较低的Sn浓度(22 ~ 143ppm)和较高的Fe3+/(Fe2+ + Fe3+)比,因此在更氧化的条件下结晶。图3的δ11B值较高,为-13.3‰~ -10.6‰,图3的δ11B流体值为-9.1‰~ -6.4‰,图1、图2的δ11B流体值为-14.0‰~ -9.0‰。因此,形成矿床的岩浆-热液系统中加入了δ11B值较高的氧化变质大气水。锡石的析出可能是由流体混合引起的氧化还原态的变化引起的。本研究为锡矿床成矿前期热液演化及成矿提供了新的重要认识。这种岩浆-热液系统的演化可能是东南锡省和其他地区锡矿床的共同过程。
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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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