河南嵩山冰川垄槽序列的发现及测年
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Discovery and Dating of Glaciage Ridge Trough Sequence in Songshan in He'nan Province
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    摘要:

    调查发现,河南嵩山南坡法王寺一带发育一套完备的冰川体系,由峻西冰斗、嵩门U谷、全新世拦马冰期巨石冰碛垄、末端的三公石冰碛垄槽序列构成。峻西冰斗具有典型冰斗特征,平坦指数F=1.93,位于典型冰斗平坦指数F=1.7~5.0之间。嵩门U谷具有典型冰蚀U形槽谷的特征,深宽比为0.28~0.36,位于世界典型冰川U谷深宽比0.24~0.45参数之间。嵩门U谷下端发育拦马冰期巨石垄,冰碛垄由不同砾径的巨石堆叠而成,空隙发育,空隙间缺少泥沙质充填,巨石表面发育各类冰川擦痕,巨石垄与蒙山拦马墙具有相同的堆积特征。末端发育三公石冰碛垄槽序列,冰碛垄呈对称分布。由于受到堆积区地形的影响,左垄比右垄更发育,左垄长750 m,宽50~80 m,内侧陡,外侧平缓,高出冰融内槽谷底8~13 m,冰碛垄由无层理、大小混杂的砾石组成,巨型漂砾表面发育有冰川擦痕及新月形断口。经光释光测年,获得一列冰碛垄的堆积年龄为(14.1±1.18) ka,对应于新仙女木降温事件。

    Abstract:

    A complete glacier system has developed in Fawangsi temple in Songshan in He'nan province. It is consisted of Junxi Ice Dipper, Songmen U Valley, Jushi Ice Ridge in Holocene Longma Ice Age, and Sangongshi Ice Ridge sequence. Junxi cirque has typical characteristics of cirque. The flatness index F is 1.93, and typical cirque flatness index F is 1.7~5.0. The Songmen U Valley has the characteristics of a typical ice eroded U-shaped trough valley, with a depth to width ratio of 0.28~0.36., while typical glacier U Valley depth to width ratio in the world is 0.24~0.45. A giant stone ridge developed in Lanma Ice Age at the lower end of Songmen U Valley. Ice stained ridges are formed by stacked giant stones of different gravel diameters. Interval develope well, and lack in mud and sand filling between the intervals. Various glacier scratches are developed on the surface of giant rock, and giant stone ridge has the same accumulation characteristics as tMengshan Lanmatou wall. At the end of the development, there is a sequence of Sangongshi glacial ridges and grooves, and glacial ridges are symmetrically distributed. Due to the influence of the terrain in the accumulation area, the left ridge is more developed than the right ridge. The left ridge is 750 m long and 50~80 m wide, with a steep inner side and a gentle outer side, and is 8~13 m higher than the bottom of ice melting trough. The glacial ridge is composed of non layered and mixed sized gravel, with glacier scratches and new moon shaped fractures developed on the surface of giant boulders. Through photoluminescence dating, the accumulation age of a row of glacial ridges was obtained to be (14.1±1.18) ka, corresponding to the cooling event of the new fairy tree

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李宝杰,程胜利,王庆军,何乐龙,丁志豪.河南嵩山冰川垄槽序列的发现及测年[J].山东国土资源,2025,41(11):

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  • 在线发布日期: 2025-09-29