四川茂县沙湾剖面晚更新世湖相沉积物的磁化率记录
摘要
2008年汶川地震使得岷江上游地区受到广泛关注。本文针对岷江上游叠溪海子边上的沙湾剖面湖相积物进行高分辨率样品采集与研究,参考以前研究结果,沙湾剖面的磁化率记录显示该湖沉积的早期和晚期磁化率值高频波动可能反映了沉积期先后发生9次和12次地震事件。它们被一段相对稳定的无震期分隔。这样的推测受到该剖面下部出现的可能与地震活动有关的沉积物变形构造的支持,这对认识研究区构造活动性、延伸地震活动记录具有十分重要的意义。
引文
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[2]Jiang,H.C.,Mao,X.,Xu,H.Y.,Yang,H.L.,Ma,X.L.,Zhong,N.,Provenance and earthquake signature of the last deglacial Xinmocun lacustrine sediments at Diexi,East Tibet[J].Geomorphology,2014,204:518~531
[3]Karlin,R.E.and Abella,S.E.B.,Paleoearthquakes in the Puget Sound region recorded in sediments from lake Washington,U.S.A[J].Science,1992,258:1617~1620
[4]Karlin,R.E.,Abella,S.E.B.,A history of Pacific Northwest earthquakes recorded in Holocene sediments from Lake Washington[J].Journal of Geophysical Research,1996,101(B3):6137~6150
[5]Troften,P.-E.,The use of varved clay chronology for dating paleoseismic events:the Erstavik record in the Stockholm area,south Sweden[J].Sedimentary Geology,2000,130:167~181
[6]Xu,H.Y.,Jiang,H.C.,Yu,S.,Yang,H.L.,Chen,J.,OSL and pollen concentrate 14C dating ofdammed lake sediments at Maoxian,east Tibet,and implications for two historical earthquakes in AD 638 and 952[J].Quaternary International
[7]Wang,P.,Zhang,B.,Qiu,W.L.,Wang,J.C.Softsediment deformation structures from the Diexi paleo-dammed lakes in the upper reaches of the Minjiang River,east Tibet[J].Journal of Asian Earth Sciences,2011,40:865~872
[8]安卫平,赵晋泉,闫小兵等.岷江断裂羌阳桥一带古堰塞湖沉积及构造变形与古地震[J].地震地质,2009,30(4):981~987
[9]聂高众,高建国,邓砚.地震诱发的堰塞湖初步研究[J].第四纪研究,2004,24:293~301
[10]余松.龙门山地区晚第四纪软沉积物变形与震积层[D].中国地质大学(武汉)
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