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首页> 外文期刊>Journal of Asian earth sciences >Electron microprobe monazite ages from a tin placer deposit on Bangka Island, Indonesia
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Electron microprobe monazite ages from a tin placer deposit on Bangka Island, Indonesia

机译：电子微探针Monazite年龄来自印度尼西亚曼卡岛的锡置矿床

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A first attempt of Electron microprobe (EMP) based Th-U-total Pb in situ dating of monazites in tailings from a placer deposit (quartz bearing sands) from Bangka Island, Indonesia, revealed for the first time from a single locality in Indonesia an age cluster around 231 Ma as well as two single grains with ages of 1133 Ma and 1916 Ma. The monazite ages from this study agree with detrital zircon ages and whole rock isochron ages from magmatic intrusions, which were reported from various localities all over the Malaysian peninsula, Myanmar and Thailand but not yet from Bangka Island. Perhaps intrusions in the closer vicinity, which could be the source of the monazite under study, have not been discovered so far or the sedimentary catchment area of the placer deposit is much larger than assumed so far. The existence of the monazite ages investigated in this study may also raise the question of the paleogeographic position of Bangka Island and the relative timing of sedimentation and Miocene rifting. However, the present work is an excellent example for the resistance of monazite and its Th-UPb system to sedimentary processes and hence is a useful tool for provenance studies and source of Rare Earth Element (REEs) recovery. An important outcome of this study is that sedimentary monazite relics often provide a wide range of unrealistic ages. Such dates may be wrongly explained in terms of recrystallization along with metasomatic process, instead these ages are only a methodic artefact because monazite relics are either not thick enough for dating or show poor surfaces with numerous cracks.
机译：基于电子微竞技（EMP）的第一次尝试从印度尼西亚曼卡岛的烧架矿床（石英轴承砂）的尾矿中的Monazites的Monazites的Situ Date进行了尾矿，这是第一次从印度尼西亚的一个地方透露年龄集群在231 mA左右，以及两年龄段的两粒，达到1133 mA，1916年。本研究中的Monazite年龄同而赞同来自岩浆入侵的邪恶锆石年龄和整个岩画等世纪，这些侵犯了来自马来西亚半岛，缅甸和泰国的各种地方，但尚未来自曼卡岛。可能在较近附近的入侵，这可能是研究中的单一的源，到目前为止尚未发现，或者放置沉积物的沉积集水区远远大于到目前为止的假设。本研究中调查的Monazite年龄的存在也可能提出曼谷岛的古地理地位的问题以及沉降和中间烯疏水的相对时序。然而，目前的作品是Monazite的抗性和其TH-UPB系统到沉积过程的优秀示例，因此是一种有用的稀土元素（REES）回收来源的原始工具。本研究的一个重要结果是沉积单藏遗物往往提供广泛的不切实际的年龄。这些日期可以在再结晶和态化过程中被错误地解释，而是这些年龄只有一种方法是一种方法人工制品，因为Monazite遗物要么足够厚，但是与许多裂缝的约会或显示差的表面。

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