晚第四纪钱塘江下切河谷充填物物源特征<sup>*</sup>

doi:10.7605/gdlxb.2018.05.062

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Abstract

In this paper,the heavy-mineral assemblages and the trace-rare earth elements of Borehole SE2 sediments in the late Quaternary Qiantang River incised valley were analyzed systematically in order to investigate their provenance and evaluate the coupling relationship between the Qiantang River and Changjiang incised valleys. Results indicate that: (1)The sediments of the river bed(U5),flood plain(U4) and ancient estuary(U3) are characterized by a heavy-mineral assemblage of hematite-limonite,magnetite,zircon,leucoxene and anatase;show a similar composition of siderophile,large-ion-lithophile,and high field-strength elements with those of the UCC,and a similarity for large-ion-lithophile elements and most high field-strength elements with those of NASC;plot towards the felsic end members in the Th/Co vs. Cr/Th plot;and bear a different distribution pattern in comparison with the modern Changjiang sediments in the Chondrile-and NASC-normalized rare-earth elements diagram. (2)The sediments of the nearshore shallow sea(U2) and modern estuary(U1) are featured by a heavy-mineral assemblage of epidote,pyroxenite,hornblendite,garnet,sphere,rutile and tourmaline;show a similar composition of siderophile elements,and depleted large-ion-lithophile and high field-strength elements compared to the UCC,and a depleted composition of siderophile,high field-strength and large-ion-lithophile elements in comparison with the NASC;plot between the Changjiang River and Qiantang River end members in the Th/Co vs. Cr/Th plot;and resemble the distribution patterns of the modern Changjiang sediments in the Chondrile-and NASC-normalized rare-earth elements diagrams. (3)The deposits of the U5,U4 and U3 units bear a different provenance with those of the U2 and U1 units, with the former derived from the intermediate-felsic source rocks,i.e. from the Qiantang River drainage area,whereas,the latter mostly originated from intermediate-mafic source rocks,namely from the Changjiang catchment,and secondly from the Qiantang River drainage. The Changjiang-derived sediments began to significantly provide sediments for the evolution of the late Quaternary Qiantang River incised-valley fill since the formation of the nearshore shallow sea(U2).

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	Articles by authors
	Zhang Xia
	Lin Chun-Ming
	Yang Shou Ye
	Gao Shu
	Robert W. Dalrymple

Key words： heavy mineral elemental geochemistry provenance Qiantang River incised-valley fill late Quaternary

Received: 26 June 2018

ZTFLH:

P534.63

Fund:

National Natural Science Foundation of China(Nos.41772097, 41572112) and the Zhejiang Provincial Key Research and Development Program(No.2018C03031)

About author: Zhang Xia,born in 1985,is an associated professor in School of Earth Sciences and Engineering,Nanjing University,with main research interest in sedimentology.

Cite this article:

Zhang Xia,Lin Chun-Ming,Yang Shou Ye et al. Provenance for the late Quaternary Qiantang River incised-valley fill[J]. JOPC, 2018, 20(5): 877-892.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2018.05.062 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2018/V20/I5/877

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