Sm–Nd dating of fluorite from the worldclass Montroc fluorite deposit, southern Massif Central, France
Sm–Nd dating of fluorite from the worldclass Montroc fluorite deposit, southern Massif Central, France
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DOI：
10.1007/s00126-004-0453-9
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发表时间：
2005-03
影响因子：
4.8
通讯作者：
M. Munoz;W. Premo;P. Courjault-Radé
中科院分区：
文献类型：
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作者：
M. Munoz;W. Premo;P. Courjault-Radé
法国中部南部地块超大型Montroc萤石脉状矿床中萤石的Sm-ND三点同位素等时线年龄为111±13 Ma。初始εNdof−为8.6时，初始87Sr/86Sr为~0.71245，反映了热液系统的上地壳来源，这与早期关于流体包裹体的工作一致，后者指示了盆地卤水的来源。约111 Ma的中白垩世年龄表明，阿尔比安/阿普提安过渡期是与北大西洋开放有关的区域伸展构造事件期间最有可能发生大规模流体循环的时期。
A three-point Sm–Nd isotope isochron on fluorite from the very large Montroc fluorite vein deposit (southern Massif Central, France) defines an age of 111±13 Ma. Initial εNdof −8.6 and initial87Sr/86Sr of ~0.71245 suggest an upper crustal source of the hydrothermal system, in agreement with earlier work on fluid inclusions which indicated a basinal brine origin. The mid-Cretaceous age of ~111 Ma suggests the Albian/Aptian transition as the most likely period for large-scale fluid circulation during a regional extensional tectonic event, related to the opening of the North Atlantic ocean.