吉林大学学报（地球科学版）
吉林大學學報（地毬科學版）
길림대학학보（지구과학판）
JOURNAL OF JILIN UNIVERSITY(EARTH SCIENCE EDITION)
2014年
6期
1883-1891
,共9页
蓝先洪%张志珣%王中波%陈晓辉%田振兴
藍先洪%張誌珣%王中波%陳曉輝%田振興
람선홍%장지순%왕중파%진효휘%전진흥
晚更新世%沉积物%常量元素%地质意义%东海陆架
晚更新世%沉積物%常量元素%地質意義%東海陸架
만경신세%침적물%상량원소%지질의의%동해륙가
Late Pleistocene%sediments%major elements%geological significance%continental shelf of the East China Sea
对东海陆架西湖凹陷区 SFK 1孔的岩性、粒度、常量元素以及测年数据的综合分析表明：元素地球化学信息对于地层的划分有良好的指示意义。SFK 1孔沉积物常量元素质量分数平均值分别为SiO265.35%、Al2 O312.12%、FeO 1.75%、CaO 3.88%、MgO 2.04%、K2 O 2.63%、Na2 O 2.04%、TiO20.66%、P2 O50.12%、MnO 0.065%、TFe2 O34.74%、CaCO35.38%，标准差系数较小，反映 SFK 1孔常量元素离散程度较小。SFK 1孔沉积物 CaCO3/TiO2、CaO/TiO2和 P2 O5/TiO2反映了化学风化程度的强弱；TiO2/Al2 O3可以作为古水流能量的指标，反映当时河流水动力条件的影响强度；而 SiO2/TiO2、Na2 O/TiO2可以用来反映沉积水动力的强度。依据常量元素质量分数垂直变化特征划分的8个层段分别与沉积物粒度、气候变化地层划分界线吻合。研究区自91 ka BP 以来沉积环境经历了剧烈变化，它们分别反映了末次间冰期(暖期)晚期以来东海陆架区沉积环境的变化。
對東海陸架西湖凹陷區 SFK 1孔的巖性、粒度、常量元素以及測年數據的綜閤分析錶明：元素地毬化學信息對于地層的劃分有良好的指示意義。SFK 1孔沉積物常量元素質量分數平均值分彆為SiO265.35%、Al2 O312.12%、FeO 1.75%、CaO 3.88%、MgO 2.04%、K2 O 2.63%、Na2 O 2.04%、TiO20.66%、P2 O50.12%、MnO 0.065%、TFe2 O34.74%、CaCO35.38%，標準差繫數較小，反映 SFK 1孔常量元素離散程度較小。SFK 1孔沉積物 CaCO3/TiO2、CaO/TiO2和 P2 O5/TiO2反映瞭化學風化程度的彊弱；TiO2/Al2 O3可以作為古水流能量的指標，反映噹時河流水動力條件的影響彊度；而 SiO2/TiO2、Na2 O/TiO2可以用來反映沉積水動力的彊度。依據常量元素質量分數垂直變化特徵劃分的8箇層段分彆與沉積物粒度、氣候變化地層劃分界線吻閤。研究區自91 ka BP 以來沉積環境經歷瞭劇烈變化，它們分彆反映瞭末次間冰期(暖期)晚期以來東海陸架區沉積環境的變化。
대동해륙가서호요함구 SFK 1공적암성、립도、상량원소이급측년수거적종합분석표명：원소지구화학신식대우지층적화분유량호적지시의의。SFK 1공침적물상량원소질량분수평균치분별위SiO265.35%、Al2 O312.12%、FeO 1.75%、CaO 3.88%、MgO 2.04%、K2 O 2.63%、Na2 O 2.04%、TiO20.66%、P2 O50.12%、MnO 0.065%、TFe2 O34.74%、CaCO35.38%，표준차계수교소，반영 SFK 1공상량원소리산정도교소。SFK 1공침적물 CaCO3/TiO2、CaO/TiO2화 P2 O5/TiO2반영료화학풍화정도적강약；TiO2/Al2 O3가이작위고수류능량적지표，반영당시하류수동력조건적영향강도；이 SiO2/TiO2、Na2 O/TiO2가이용래반영침적수동력적강도。의거상량원소질량분수수직변화특정화분적8개층단분별여침적물립도、기후변화지층화분계선문합。연구구자91 ka BP 이래침적배경경력료극렬변화，타문분별반영료말차간빙기(난기)만기이래동해륙가구침적배경적변화。
Based upon analysis of lithology,grain-size,major elements and dating data for core SFK 1,which is located in the depression area of Xihu on the continental shelf of East China Sea,this contribution studied the geochemical characteristics of sediments since the Last Pleistocene.The results showed that geochemical information of elements has good indicator significances to stratigraphical division.The mean of each major element was respectively SiO2 65.35%,Al2 O3 12.12%,FeO 1.75%, CaO 3.88%,MgO 2.04%,K2 O 2.63%,Na2 O 2.04%,TiO2 0.66%,P2 O5 0.12%,MnO 0.065%, TFe2 O3 4.74%,CaCO3 5.38%,with less coefficient of variation,indicated a smaller divergent extent of major element.The variations of CaCO3/TiO2 ,CaO/TiO2 and P2 O5/TiO2 ratios can reflect the intensity of weathering;The TiO2/Al2 O3 ratio can be used as a paleo-stream energy indicator to reflect the intensity of stream hydrodynamic conditions;The variations of SiO2/TiO2 ,Na2 O/TiO2 ratios can be used as proxies to reconstruct the sedimentary hydrodynamic conditions for the whole core sediment. The divisions of the 8 layers are respectively connected with the grain size of sediment,climate change boundary,strata boundaries according to the vertical variation characteristics of major elements,which reflect the change of sediment environment in East China Sea since the late last interglacial cycle (warm period).
