Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: Deep marine trace element enrichment during the Second Great Oxygenation Event
Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: Deep marine trace element enrichment during the Second Great Oxygenation Event
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DOI：
10.1111/ter.12331
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发表时间：
2018-06
期刊：
影响因子：
2.4
通讯作者：
J. Armstrong;J. Parnell;L. Bullock;Magali Perez;A. Boyce;J. Feldmann
中科院分区：
文献类型：
--
作者：
J. Armstrong;J. Parnell;L. Bullock;Magali Perez;A. Boyce;J. Feldmann
英国晚新元古代Gwna群（570 ~ 580 Ma）黑色页岩中，碲（Te）、硒（Se）和钴（Co）富集。Te和Co的富集程度可与现代深海锰铁地壳的富集程度相比较。Gwna群沉积与第二次大氧化事件同时发生，对全球微量元素的固定产生了显著影响。这些黑色页岩中的硒和Te浓度表明大陆风化速率增加，生物生产力高，大气中O2浓度相应增加。钴、镍（Ni）和砷（As）的富集属于次生矿化阶段。对在Gwna群黑色页岩中发现的许多富集微量元素的需求，使其在地质记录中的富集机制和变化具有重要意义，并表明可以根据该时期的黑色页岩原岩寻找新的资源。
Black shales of the late Neoproterozoic Gwna Group (570–580 Ma), UK, contain enrichments of tellurium (Te), selenium (Se) and cobalt (Co) relative to average shale compositions. The Te and Co enrichments bear comparison with those of ferromanganese crusts in the modern deep ocean. Gwna Group deposition coincides with the Second Great Oxidation Event, which had a significant effect on trace element fixation globally. Selenium and Te concentrations within these black shales indicate increased continental weathering rates, high biological productivity and corresponding increases in atmospheric O2 concentrations. Cobalt, nickel (Ni) and arsenic (As) enrichments in this succession are secondary mineralisation phases. Demand for many of the trace elements found enriched in the Gwna Group black shales make their mechanisms of accumulation, and variations through the geological record, important to understand, and suggests that new resources may be sought based on black shale protoliths from this period.