scholarly journals Metallic mineralization associated with pillow basalts in the Yaeyama Central Graben, Southern Okinawa Trough, Japan

2006 ◽  
Vol 3 (0) ◽  
pp. 1-8 ◽  
Author(s):  
Makoto Watanabe ◽  
Kenichi Hoshino ◽  
Ryota Shiokawa ◽  
Yuki Takaoka ◽  
Hideo Fukumoto ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Southern Okinawa Trough

scholarly journals Rare earth element geochemistry of sediments from the southern Okinawa Trough since 3 ka: Implications for river-sea processes and sediment source

2019 ◽  
Vol 11 (1) ◽  
pp. 929-947
Author(s):  
Siyi Hu ◽  
Zhigang Zeng ◽  
Xue Fang ◽  
Bowen Zhu ◽  
Xiaohui Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Okinawa Trough ◽  
Sediment Source ◽  
Sediment Sources ◽  
Terrigenous Sediments ◽  
Southern Okinawa Trough ◽  
Ree Fractionation ◽  
Siliciclastic Sediments

Abstract The sediment sources in the southern Okinawa trough (SOT) are still controversial and few studies have focused on the effects of transport processes on the elemental composition of initial terrigenous materials. Here we present rare earth element (REE) and trace element data on siliciclastic sediments from 14C age-dated Core S3, which was collected from the SOT, to provide reliable evidence for illustrating the modified effects of marine environments on terrigenous sediments deposited at different stages and exposing changes in sediment source over the past 3 ka. Compared with bulk sediments, the siliciclastic sediments in S3 have more variable REE fractionation parameters and lower middle REE (MREE) contents. Our REE data indicate that during river-sea processes, MREE-enriched fractions such as Fe–Mn oxides and carbonate were added to the original terrigenous sediments before deposition, weakening the degree of REE fractionation in the initial sediments; thus, care should be taken when using REE data from bulk samples to decipher source changes. The temporal changes in sediment source in S3 can be broadly identified based on the REE fractionation parameters of the residual fractions, and the results are largely consistent with the findings obtained by heavy mineral examinations. Units 1 and 3 are dominated by reworked shelf sediments of Changjiang origin,while the proportion of Taiwan-derived sediment is notably higher in Units 2 and 4. The sediment flux of Taiwan origin in the SOT was much smaller than previously thought. Huanghe-derived sediments and volcanic materials did not contribute significantly to the late Holocene sedimentation in the SOT. The large variations in sediment sources in S3 were possibly caused by changes in transport patterns driven by time-dependent changes in oceanic currents.

Microearthquakes and faulting in the southern Okinawa Trough

2003 ◽  
Vol 372 (3-4) ◽  
pp. 167-177 ◽  
Author(s):  
Mamoru Nakamura ◽  
Hiroshi Katao
Keyword(s):  
Okinawa Trough ◽  
Southern Okinawa Trough

scholarly journals Linkages between turbidites in the southern Okinawa Trough and submarine earthquakes

2004 ◽  
Vol 31 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Chih-An Huh ◽  
Chih-Chieh Su ◽  
Wen-Tzong Liang ◽  
Chiao-Yuen Ling
Keyword(s):  
Okinawa Trough ◽  
Southern Okinawa Trough ◽  
Submarine Earthquakes
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