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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24910

Title: Nannofossil biochronology of tephra layers in core MD972143, Benham Rise, western Philippine Sea
Authors: Kuo-Yen Wei;Teh-Quei Lee;the Shipboard Scientific Party of IMAGES III/MD106-IPHIS Cruise (Leg II)
Contributors: NTOU:Institute of Applied Geosciences
Keywords: Philippine Sea;Volcanic ash;Pliocene;Pleistocene;Nannofossil
Date: 1998-03
Issue Date: 2011-10-20T08:18:12Z
Publisher: Terrestrial, Atmospheric and Oceanic Sciences
Abstract: abstract:During the IMAGES III-IPHIS-Leg II Cruise in June 1997, a long piston core, MD972143 (15°52.262'N, 124°38.96'E, water depth 2989 m), was raised from Benham Rise, east of Luzon in the western Philippine Sea. The core measures 38 m in length, consisting mainly of calcareous ooze. Intercalated conspicuously in this thick sequence of calcareous ooze are 21 volcanic layers. Four major age-diagnostic nannofossil datum levels were recognized: the first appearance datum (FAD) of Emiliania huxleyi (0.27 Ma) at 365 cm, the last appearance datum (LAD) of Pseudoemiliania lacunosa (0.46 Ma) at 1105 cm, the LAD of Calcidiscus macintryrei (1.59 Ma) at 2510 cm and the LAD of Discoaster broweri (1.95 Ma) at 2970 cm. A turbidite layer at 33 to 34 m, consisting mainly of foraminiferal sands, appears to truncate the sequence and result in a hiatus. The age of the lowermost part of the core (34-38 m) was constrained as being older than 2.59 Ma (the last appearance of D. surculus) and younger than 2.78 Ma (the last appearance of D. tamalis). Based upon our preliminary nannofossil biochronology, these tephra layers were deposited at 2.65 Ma (?), 2.1 Ma, 1.9 Ma, 1.7-1.8 Ma, 1.5 Ma, 1.35 Ma, 0.9 Ma, 0.8 Ma and 0.5-0.3 Ma, respectively.
Relation: 9(1), pp.153-163
URI: http://ntour.ntou.edu.tw/handle/987654321/24910
Appears in Collections:[應用地球科學研究所] 期刊論文

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