Sm-Nd Isotope Dating of Some Ca-bearing Minerals in Hydrothermal Deposits
Sm-Nd Isotope Dating of Some Ca-bearing Minerals in Hydrothermal Deposits
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发表时间：
2006
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通讯作者：
Zhang Dongliang
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作者：
Zhang Dongliang
Sm和Nd的离子半径和化学性质相似，母体147 Sm经α衰变后的子体143 Nd与母体在矿物晶格中占据相同位置，Sm-Nd同位素体系易于封闭，抗后期蚀变和风化作用。然而，Sm-Nd年代学主要应用于前寒武纪地质年代学研究，在热液成矿作用方面的应用较少，定年对象主要局限于陨石、月岩、古超基性岩和基性岩、前寒武纪变质岩或沉积岩。近年来的一些研究表明，某些热液含钙矿物具有较高的稀土元素含量和明显的Sm/Nd分馏，在各种热液成矿作用的精确定年方面具有很大的潜力。本文对萤石、白钨矿、方解石和电气石的Sm-Nd同位素定年研究进行了综述，并对其在热液矿床中的进一步应用进行了展望，旨在推动我国Sm-Nd同位素年代学的发展。
Both Sm and Nd are similar in ionic radius and in chemical properties, the daughter 143 Nd decayed by the parent 147 Sm through α-process can occupy the same site in mineral lattice as its parent, thus Sm-Nd isotope systematics is easily be closed and can resist later alteration and weathering. However, Sm-Nd chronometer has predominately been applied in Precambrian geochronological studies in the past, few similar applications have been carried out on hydrothermal mineralization, and the dated objectives are mainly restricted in meteorite, lunar rocks, ancient ultrabasic and basic rocks, and Precambrian metamorphic or sedimentary rocks. Some researches in recent years indicate that, some hydrothermal Ca-bearing minerals display relatively high REE concentrations and obvious Sm/Nd fractionation, and show great potentials in precisely dating various hydrothermal mineralization. Sm-Nd isotope dating studies on fluorite, scheelite, calcite and tourmaline are summarized in this paper, and their further application in hydrothermal deposits are expected, which aims to promote the development of Sm-Nd isotope geochronology in China.