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首页> 外文期刊>Mineralium deposita >U-Pb geochronology of tin deposits associated with the Cornubian Batholith of southwest England: Direct dating of cassiterite by in situ LA-ICPMS
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U-Pb geochronology of tin deposits associated with the Cornubian Batholith of southwest England: Direct dating of cassiterite by in situ LA-ICPMS

机译：与西南英格兰山茱萸的U-PB地形学，与西南英国山茱萸有关：通过原位La-ICPMS直接约会Cassiterite

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摘要

The Cornwall and Devon vein- and greisen-type copper and tin deposits of southwest England are spatially and genetically related to shallow-seated granitic intrusions. These late Variscan intrusions, collectively known as the Cornubian Batholith, extend over 200 km and form a continuous granitic spine from the Isles of Scilly Granite in the west to the Dartmoor Granite in the east. The granitic plutons of the Cornubian Batholith were intruded from similar to 295 to 270 Ma without a major hiatus. Twelve samples of cassiterite (SnO2) were obtained from tin deposits associated with seven different plutons within the Cornubian Batholith for in situ LA-ICPMS U-Pb dating. This study of cassiterite was undertaken to obtain the first results of direct dating of ore mineral to refine the geochronology of tin mineralization in this region. Of the cassiterite samples analyzed, the oldest ages were determined within the Kit Hill and Hingston-Gunnislake Granites in the central part of the Cornubian Batholith. The Hingston-Gunnislake cassiterite, from Drakewalls Mine, was the oldest sample dated at 291.8 +/- 3.4 Ma. The next oldest dates, 290.5 +/- 2.8 and 288.5 +/- 2.9 Ma, were from two cassiterite samples extracted from the adjacent Kit Hill Consolidated Mines within the Kit Hill Granite. At the eastern end of the study area, two cassiterite samples within the Dartmoor Granite produced ages of 286.0 +/- 1.8 and 284.1 +/- 1.3 Ma. The youngest sample from this study, 275.4 +/- 1.6 Ma, is from the Balleswidden Mine within the westernmost Land's End Granite. The cassiterite dates do not reveal any readily observable relationship between ore ages and geographic relationship from west to east throughout the Cornubian Batholith. Incorporating the associated errors, the geochronology does indicate continuous mineralization within the granites for similar to 21 million years, from ca. 295 to 274 Ma. This span falls within the established period of granitic magmatism of ca. 295 to 270 Ma for the Cornubian Batholith and further confirms the reliability of in situ LA-ICPMS U-Pb dating of cassiterite.
机译：西南英国西南部的康沃尔和德文静脉和铜型铜和锡矿床在空间上和遗传相关的浅层花岗岩侵入性。这些已故的瓦斯卡普兰入侵，统称为Cornubian浴室，延伸超过200公里，从西方的Scilly Granite岛到东部的斯卡德花岗岩岛形成连续的花岗岩脊柱。没有主要的中断，玉米氏绞盘的花岗岩型材侵入到295至270 mA。从锡沉积物中与七种不同型芦苇的锡沉积物中获得十二个羰基团（SnO2），用于玉米座浴池中的七种不同的型芦苇。本对咔缕辛铁的研究是为了获得矿石矿物直接约会的第一个结果，以改善该地区锡矿化的地理学。在分析的咔铝样品中，最古老的年龄在Cornubian Batholith的中心部分内确定了Kit Hill和Hingston-Gunnislake花岗岩。来自Drakewalls Mine的Hingston-Gunnislake Cassiterite是291.8 +/- 3.4 mA的最古老的样本。下一个最古老的日期，290.5 +/- 2.8和288.5 +/- 2.9 mA来自两种从Kit Hill Granite内的邻近套件山综合矿井中提取的两种配录样品。在研究区域的东端，Dartmoor花岗岩内的两个配录样品产生了286.0 +/- 1.8和284.1 +/- 1.3 mA。本研究中最小的样本，275.4 +/- 1.6 mA，来自最西部的陆地花岗岩内的Balleswidden矿井。卡斯特尼的日期没有透露在整个Cornubian浴场的西部到东部到东部的矿石和地理关系之间的任何容易观察的关系。结合了相关的错误，地理论神论确实表明花岗岩内的连续矿化，类似于2100万年，来自CA. 295到274 mA。这种跨度在CA的花岗岩岩浆中的既定时期下降。 295至270 mA对于Cornubian Batholith，并进一步证实了原位La-ICPMS U-PB的可靠性Cassiterite的约会。

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