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渭河宝鸡段发育五级河流阶地,分别形成于1.2MaBP、0.8MaBP、0.5MaBP、0.13MaBP、0.009MaBP。它们是第四纪早更新世中期以来,青藏高原整体隆升过程中几个大幅度抬升阶段及其驱动的气候变化的响应,记录了准0.4Ma、准0.1Ma周期的构造气候旋回与亚旋回。这种尺度的构造气候旋回与黄土—古土壤序列记录的天文气候旋回很吻合,表明它们在成因机制上的某种内在联系,深刻认识这一点,将有助于全面理解区域环境演化的规律性与差异性。文中还初步探讨了渭河贯通陇山的时代和统一水系的形成问题。
Five stages of river terrace are formed in Baoji section of Weihe River and formed at 1.2MaBP, 0.8MaBP, 0.5MaBP, 0.13MaBP and 0.009MaBP respectively. These are the responses of several large uplifts and their driving changes in climate during the whole uplift of the Qinghai-Tibet Plateau since the mid-early Pleistocene Quaternary. The tectonic climate cycles of quasi-0.4Ma and quasi-0.1Ma cycles are recorded Sub-cycle. This scale of tectonic climatic rotation is in good agreement with the astronomical and climatic cycles of loess-paleosol sequence records, indicating some intrinsic relationship between them in genetic mechanism. A deep understanding of this will help to fully understand the regularity of regional environmental evolution And difference. The article also initially discussed the formation of the Weihe River through the Longshan era and the formation of a unified water system.