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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Magnetostratigraphy of the Middle Miocene continental sedimentary sequences of the Mae Moh Basin in northern Thailand: evidence for counterclockwise block rotation
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Magnetostratigraphy of the Middle Miocene continental sedimentary sequences of the Mae Moh Basin in northern Thailand: evidence for counterclockwise block rotation

机译：泰国北部Mae Moh盆地中新世中部陆相沉积层序的地层学：逆时针旋转的证据

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摘要

A magnetostratigraphic study has been performed on the Mae Moh basin, well known for its lignite mining in the Lampang province. Paleomagnetic samples were collected from 66 stratigraphic levels. Rock magnetic investigations indicate the presence of low coercivity minerals. Specimens subjected to progressive thermal (or alternating field) demagentization procedures show that nearly all of then exhibit a low temperature magnetization component, and a high temperature characteristic component (ChRM), with either positive or negative virtual geomagnetic pole latitudes and opposite polarity, considered as the characteristic Miocene magnetization. The overall mean paleomagnetic direction (incl. = 22.2°, decl. = 358.3°,κ = 15, α_(95) = 4) documents a counterclockwise vertical axis rotation of about 13°± 1.32 with respect to the expected Miocene direction derived from the Eurasian polar wander curve (incl. =42°, decl. = 11°). Our paleomagentic results are not consistent with the previously reported paleomagnetic data. The rotation observed in the Mae Moh basin can be the response to local tectonics. A section sampled for magnetostratigraphy reveals a polarity sequence of nine magentozones that can reliably be correlated to the geomagnetic polarity time scale. According to biochronological constraints, the magetostratigraphic results from the mammal-bearing succession correlate with chron C5ABn-C5An2n, between 13.5 and 12.1 Ma. According to the and K1, K2 lignite zones were the mammal remains were found.
机译：在湄南盆地进行了磁地层学研究，湄南盆地以在南邦省的褐煤开采而闻名。从66个地层中收集了古磁性样品。岩石磁研究表明存在低矫顽力矿物。经受渐进式热（或交变场）去磁程序的样品表明，几乎所有样品都表现出低温磁化分量和高温特征分量（ChRM），具有正负虚拟地磁极纬度和相反极性，被认为是中新世磁化特征。总体平均古磁方向（包括= 22.2°，包括= 358.3°，κ= 15，α_（95）= 4）表明相对于预期的中新世方向逆时针垂直轴旋转约为13°±1.32欧亚极地漂移曲线（包括= 42°，decl。= 11°）。我们的古地磁结果与先前报道的古磁数据不一致。在湄茂盆地观测到的自转可能是对局部构造的响应。进行地磁地层取样的断面显示了9个磁极区的极性序列，这些磁极区可以可靠地与地磁极性时标相关联。根据生物年代学上的限制，哺乳动物继承的地层学结果与年代C5ABn-C5An2n相关，介于13.5和12.1 Ma之间。根据和，发现了哺乳动物遗体的K2褐煤带。

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