RADIOLARIA IN SURFACE SEDIMENTS FROM MARGINAL BASIN OFF SOUTHWEST TAIWAN

臺灣西南海域放射蟲之研究

葉貴玉(KUEI-YU YEH) ； 程延年(YEN-NIEN CHENG)

《Collection and Research》 2期 (1990/12) Pp. 65-87

https://doi.org/10.6693/CAR.1990.2.2

摘要

Radiolarian faunas were analyzed for the surface sediments from the basin to the southwest of Taiwan. In this study, the occurrence of radiolarian faunas shows that 1) Radiolaria occurs from shallow coastal environmentto the deep area; 2) the abundance and diversity of Radiolaria in the sediments are mainly controlled by the depth; the diversity of radiolarian assemblage increases with increasing depth. Radiolarian assemblages in the sediments may indicate the variation of water masses of past. A preliminary test shows that during the deposition of these surface sediments, the water column of deep area consisted of at least three water masses; the boundaries of upper three water masses were possibly around the depths at 130 and 300 meters, respectively.

關鍵字

Radiolaria ； Surface Sediments ； Water Mass

並列摘要

本文為西太平洋表層沉積物放射蟲系列研究報告之二。本研究區僅局限於臺灣西南，亦即從北緯22°04' 至22°28' ，東經119° 53' 至120°37'之海域。根據三十三個採自大陸棚及大陸斜坡表層沉積物之放射蟲分析，可得下列之初步結論：一、不論是淺海或深海的沉積物皆有可能保存放射蟲。二、沉積物中放射蟲種數及個數之多寡通常與深度成正比。但受陸相沈積物干擾較強的地方，，即使在深處放射蟲含量仍極稀。三、根據放射蟲族群分析之結果，本區之深海地帶至少出現過三個性質不同的水團。水團間之分界大約在水深130米及300米處。

並列關鍵字

放射蟲 ； 表層沉積物 ； 水團