福建深沪湾潮间带沉积异质体及其成因初探

深沪湾潮间带并列着两种性质迥异的沉积异质体——沉溺古树林和牡蛎礁。其号观性质、形成年代和沉积特征都有显著差异。古树林主要树种有：油杉(Keteleeria)、桑树(Mouas)和皂荚(Gleditisia)等，属于亚热带常绿落叶阔叶混交林，^14C测量表明其生长于7000aBP前后；牡蛎礁造礁生物主要属种有：近江重蛎(Crassostrea riwlaris)，长重蛎(Crassostrea gigas Tunbers)等。属于河口贝类，^14C测量表明其生长于20000aBP左右。地貌调查和钻孔沉积物分析显示：牡蛎礁是晚更新世古河口的产物，古树林是全新世河道古土壤生长林，两者被埋藏后近代重现海滩。

DISCUSSION ON THE DIFFERENT SEDIMENTARY BODIES AND THEIR GENESIS AT SHENHU BAY, FUJIAN PROVINCE

A geographic investigation, biological identification and sediment analysis was conducted on two sedimentory bodies juxtaposed in the same tidal zone of S henhu bay. There is a submerged forest made of Keteleeria, Mouas and Gleditisia with 14C dating from 7000a BP and an oyster bank with Crassostrea rivularis Gou ld and C.gigas Funbers with 14C dating of 20 000 a B P. It was concluded that the oyster bank was a product of a late Pleistocene estuar y and the submerged forest was the Keteleeria forest growing in soil in the pale o-river course. Both were buried by sediment, and recently discovered in recent ly in the beach.