【摘要】 江北砾岩是河流砾石层在地表经胶结形成的沉积岩,虽然前人对其成岩时代与环境做了较多的研究但仍存在严重争议。本研究采用14C、U系法、ESR等定年技术、碳同位素分析手段对其成岩时代及环境条件进行了研究。研究结果表明,江北砾石层的堆积年代应为1~4万年,胶结年代应大致为1~2.43万年。晚更新世晚期至全新世初期干冷气候是其胶结成岩的主要原因。更多还原

【Abstract】 Jiangbei conglomerate is a kind of supergene cemented rock.Up to now,its diagenetic reasons are not researched deeply and there are different conclusions about the diagenetic reason.The diagenetic chron and environment are studied with¹⁴C,ESR and U-Th dating method and δ¹³C analysis in this paper.It is concluded that the sedimental time of Jiangbei conglomerate was between 10000 and 40000 years,the diagenetic chron was between 10000 and 24300 years.The arid and cold climate during the last stage of late Pleistocene and early Holocene are the major conditions for its diagenesis.更多还原