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首页> 外文期刊>Journal of Volcanology and Geothermal Research >OSL dating of a Pleistocene maar: Birket Ram, the Golan heights
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OSL dating of a Pleistocene maar: Birket Ram, the Golan heights

机译：OSL约会更新世的玛尔：伯吉特·拉姆，戈兰高地

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摘要

Direct dating of maars and their phreatomagmatic deposits is difficult due to the dominance of lithic (host rock) fragments and glassy particles of the juvenile magma. In this paper we demonstrate that optically stimulated luminescence (OSL) dating can be successfully used for age determination of phreatomagmatic deposits. We studied the tuff deposit of Birket Ram, a basanitic maar located at the northern edge of the Golan heights on the western Arabian plate. The maar is underlain by a thick section of Pleistocene basalts, and currently hosts a small lake. It is filled by approximately 90 m of lacustrine sediments with radiocarbon ages extrapolated to 108 ka at the base. OSL was applied to quartz grains extracted from tuffs and paleosols in order to set the time frame of the phreatomagmatism at the site. A maximum age constraint of 179 ± 13 ka was determined for a paleosol that underlies the maar ejecta. Quartz grains from two layers in the tuff section yielded a direct age of 129 ±6 ka for the phreatomagmatic eruption. A younger age of 104 ±7 ka, which was determined for a tuff layer underlying a basaltic flow, was attributed to thermal resetting during the lava emplacement. This was confirmed by an ~(40)Ar/~(39)Ar age of 101 ±3 ka determined on the overlying basalt. The internal consistency of the OSL ages and the agreement with the ~(40)Ar/~(39)Ar age determination as well as with previous estimates demonstrates the potential of OSL for maar dating.
机译：由于幼年岩浆的岩性（宿主岩）碎片和玻璃状颗粒占主导地位，很难对马氏体及其吞噬岩浆沉积进行直接测年。在本文中，我们证明了光激发发光（OSL）测年可以成功地用于确定岩浆岩沉积物的年龄。我们研究了Birket Ram的凝灰岩矿床，这是一种位于阿拉伯西部西部戈兰高地北缘的玄武岩。该树丛被厚厚的更新世玄武岩所掩盖，目前拥有一个小湖。它被大约90 m的湖相沉积物充满，放射性碳的年龄被推断到该基地的108 ka。 OSL用于从凝灰岩和古土壤中提取的石英颗粒，以设定现场岩浆作用的时间范围。确定了位于马累喷出物下面的古土壤的最大年龄限制为179±13 ka。凝灰岩层中两层的石英颗粒的直接年龄为129±6 ka。确定为玄武岩流下面的凝灰岩层的年龄为104±7 ka，这是由于熔岩安置期间的热复位所致。在上层玄武岩上测得的〜（40）Ar /〜（39）Ar年龄为101±3 ka。 OSL年龄的内部一致性以及与〜（40）Ar /〜（39）Ar年龄确定以及与先前估计的一致性证明了OSL在进行玛氏测年中的潜力。

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