Origin and route of the Neogene deep sea molluscan fauna in Ryukyu Islands

琉球群岛新近纪深海软体动物群的起源和路线

• 批准号: 09839006
• 负责人: NODA Hiroshi
• 金额: $ 1.73万
• 依托单位: University of Tsukuba, Institute of Geoscience
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09839006/
• 关键词: Okinawa; Neogene; Pliocene; Deep sea; Mollusca; Echinoid fossils; Benthic foraminifers; Shinzato Formation; 鮮新世; 海胆類化石; 軟体動物化石; 海胆化石; 有孔虫化石; 第三系; 深海性; 知念層

The stratigraphy and paleontology of the Neogene and Quarternary deposits in Okinawa and Kume-jima were examined. According to paleontological studies on the molluscs, echinoids and foraminifers from the Yonabaru and Shinzato Formations by Noda, Kikuchi and Kawagara, repectively, the dominant and characteristic deep sea faunas were recognized. Most of deep sea molluscan faunas become dominant from the Yonabaru and were disappeared at the end of the Shinzato (MacNeiL, 1961, Noda, 1980, 1988, 1991, 1998) as like the echinoid faunas (Kikuchi's research). Thatcheria shows similar biogeographical distribution with that of Teramachia. Phanerolepida shows peculiar morphological variation and shows similar distitribution with that of Teramachia on both sides of the Pacific. Most of deep sea mollsucs had been appeared from the Yonabaru and disappeared at the end of the Shinzato. A total of 112 species of benthic foraminifers from the late Miocene to Pliocene Maja and Aka Formations were identified by Kawagata and show the bathymetric changes from 100 to 50 m in their depositional depth.

对冲绳和久米岛的新近纪和第四纪沉积物进行了地层学和古生物学研究。野田、菊池和川原分别对与那原组和新里组的软体动物、海胆类和有孔虫进行了古生物学研究，确定了深海的优势和特征动物群。大多数深海软体动物群从与那原开始占主导地位，并在新里纪末期消失（MacNeiL, 1961, Noda, 1980, 1988, 1991, 1998），就像海胆动物群（Kikuchi 的研究）一样。 Thatcheria 的生物地理分布与 Teramachia 相似。 Phanerolepida表现出奇特的形态变异，与太平洋两岸的Teramachia表现出相似的分布。大多数深海软体动物是从与那原海峡出现的，并在新里海峡末端消失。 Kawagata 鉴定出了中新世晚期至上新世 Maja 组和 Aka 组的 112 种底栖有孔虫，并显示了沉积深度从 100 到 50 m 的水深变化。

项目成果

Noda H.and Nakagawa T.: "Deep sea ripple marks from the Eocene Kayo Formation in the middle part of Okinawa-jima, Okinawa Prefecture, Southwest Japan"Ann. Rep. ,Inst. Geosci., Univ. Tsukuba. No.24. 65-69 (1998)

野田 H. 和中川 T.：“来自日本西南部冲绳县冲绳岛中部始新世 Kayo 组的深海波纹痕迹”Ann。

Noda H.: "Notes on Teramachia(Mollusca ; Gastropoda) from Pliocene Shinzato Formation In Okinawa, Southwest Japan"Ann. Rep. ,Inst. Geosci., Univ. Tsukuba. No.24. 71-74 (1998)

野田 H.：“日本西南部冲绳上新世 Shinzato 组中的 Teramachia（软体动物；腹足纲）注释”Ann。

Noda, H. and Nakagawa, T.: "Deep sea ripple marks from the Eocene Kayo Formation in the middle part of Okinawa-jima, Okinawa Prefecture, Southwest Japan."Ann. Rep., Inst. Geosci., Univ. Tsukuba. No. 24. 65-69 (1998)

Noda, H. 和 Nakakawa, T.：“来自日本西南部冲绳县冲绳岛中部始新世 Kayo 组的深海波纹痕迹。”Ann。