河南鹤壁尚峪新生代上地幔流变特征及构造意义

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对河南鹤壁尚峪新生代橄榄霞石岩火山颈中的上地幔橄榄岩捕虏体的流变学进行了研究.结果表明,鹤壁地区新生代辉石地温总体上低于东南沿海及下扬子地区,有两种地温特征.其中全部尖晶石二辉橄榄岩及个别方辉橄榄岩的投影点落在大洋地温曲线上,甚至高于大洋地温,与中国东部新生代辉石地温特征吻合;而多数尖晶石方辉橄榄岩的投影点靠近地盾地温曲线或落在地盾地温曲线上;全部金云母方辉橄榄岩的投影点低于地盾地温.样品的差异应力(20~34MPa)则普遍低于中国东部差异应力平均值(30MPa).应用流动速率及等效粘滞度与深度的数据投影,部分样品落于克拉通区,部分样品靠近大陆拉张带,同样也显示具有双重性特征.鹤壁的资料证实在该地区可能存在有古老克拉通岩石圈的残余,它们仍保留有低温及富集地幔的特征 The rheology of the upper mantle peridotite xenoliths in the Shangyu Neoproterozoic nepheline volcanic neck of Hebi, Henan Province was studied. The results show that the Cenozoic pyroxene temperature in Hebi area is generally lower than that in the southeast coast and the lower Yangtze region, and there are two kinds of geothermal characteristics. Among them, the projection points of all spinel lherzolites and individual lherzolites fall on the geothermal curve of the ocean, even higher than the geothermal temperature, which is consistent with the characteristics of the Cenozoic pyroxene geotherms in eastern China. The projection points of the most spinel-harlinite Close to the ground temperature curve or ground shield on the ground temperature curve; all the phlogopite hilite projection point below ground shield temperature. The differential stress (20 ~ 34MPa) of the sample is generally lower than the average stress difference (30MPa) in eastern China. Application of flow rate and equivalent viscosity and depth of data projection, part of the sample is located in the craton area, part of the sample pull the band near the mainland, also showed a dual nature. Data from Hebi confirm that there may be remnants of ancient cratonic lithosphere in the area, which still retain the features of low temperature and enriched mantle
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