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1、第29卷第9期地質(zhì)通報(bào)VO1．29．NO．92010年9月GE0LoGICALBULLETIN0FCHINASep．，2010陜西富平地區(qū)中奧陶統(tǒng)等深流沉積的特征及其地質(zhì)意義屈紅軍，梅志超，李文厚，關(guān)利群，馮楊偉，范玉海QUHong-j1．11"1，MEIZhi—chao，LIWen—hou，GUANLi—qun，F(xiàn)ENGYang—wei，F(xiàn)ANYu—hai大陸動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室／西北大學(xué)地質(zhì)學(xué)系，陜西西安710069StateKeyLaboratoryofContinentMDynamics／DepartmentofGeology．NorthwestUniversity,710069．Sh
2、aonxi,China摘要：陜西富平趙老峪地區(qū)中奧陶統(tǒng)趙老峪組發(fā)育一套與深水碳酸鹽巖重力流沉積、放射蟲硅質(zhì)巖、火山凝灰?guī)r伴生的等深流沉積。根據(jù)巖性特征可以將該等深流沉積劃分為礫屑等深積巖、砂屑等深積巖、粉屑等深積巖和灰泥等深積巖4種類型．識(shí)別出較完整的、由單一灰泥或粉屑或砂屑等深積巖疊置組成的4種等深積巖層序。等深流的流向從東北向西南方向。說(shuō)明中奧陶世富平地區(qū)可能是秦嶺北側(cè)弧后盆地伸進(jìn)淺水臺(tái)地的一個(gè)北東向的深海前槽。富平趙老峪地區(qū)下奧陶統(tǒng)馬家溝組和華北地塊其他地區(qū)一樣都發(fā)育淺水臺(tái)地相碳酸鹽巖，中奧陶統(tǒng)突變?yōu)樯钏逼乱慌璧剡吘壪嗟奶妓猁}巖重力流及等深流沉積．而同期華北地塊主體隆升為陸．反映了在揚(yáng)
3、子板塊向華北板塊俯沖的背景下，秦嶺北側(cè)早古生代弧后盆地北測(cè)的陷落下沉作用。關(guān)鍵詞：中奧陶統(tǒng)；趙老峪組；富平地區(qū)；等深積巖；弧后盆地中圖分類號(hào)：P534．42；P512．2文獻(xiàn)標(biāo)志碼：A文章編號(hào)：1671—2552(2010)09—1304—06QuHJ，MeiZC，LiWGuanLQ，F(xiàn)engYW，F(xiàn)anYH．ThecharacteristicsofMiddleOrdoviciancontourcurrentdepositsandgeologicalimplicationinFupingregion,ShaanxiProvince，China．GeologicalBulletinofChina
4、,2010,29(9)：1304--1309Abstract：InFupingZhaolaoyuregionofShaanxiProvince，MiddleOrdovicianZhaolaoyuFormationdevelopedasuiteofcontourites，whichwasassociatedwithdeepwatercarbonategravity—flow，radiolarianchertandvolcanictuf．Accordingtotheirlithologiccharac—teristics，thecontouritescanbeclassifiedintofourt
5、ypes，respectivelypsephiticcontourite，calcareniticcontourite，calcisiltiticcontourite，andcalcilutiticcontouriteFourtypesofcontouritesequenceswereidentifiedas，whicharecomposedbytheoverlyingofsub—inte-gratedsequence，singlecalcilutititesequencewithcalcisiltititeorcalcilutiticclot，singlecalcisiltiticconto
6、uritesequence，andsinglepsephiticcontouritesequence．ThecontourcurrentWasfromnortheasttosouthwest，whichsuggestedthatmiddleOrdovicianFupingregionmaybeanortheasternabyssalanteriortroughinMiddleOrdovicianepoch，developingfromarcrearbasinsonthenorthofQinlingfingeringintoshallowplateau．InfupJngZhaolaoyuIe§o
7、nLowOrdovicianMajiagonFormation．1ikeotherregionsofHuabeiblock，developedshallowplateaufaciescarbonate．ButinMiddleOrdovicianfacieschangedsuddenlyintodeepwaterslope—basinmarginfaciescarbonategravity—flow
