Provenance analysis of psammitic gneisses in the Hida, Maizuru, Ryoke and Kurosegawa terranes, viewed from detrital heavy minerals

从碎屑重矿物角度分析飞騨地体、舞鹤地体、Ryoke地体和黑濑川地体的砂质片麻岩的物源分析

• 批准号: 03452068
• 负责人: ADACHI Mamoru
• 金额: $ 4.42万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452068/
• 关键词: CHIME (Chemical Th-U-total Pb Isochron Method); Detrital heavy minerals; Precambrian zircon; Precambrian detrital monazite; Hida terrane; Mino terrane; Maizuru terrane; Kurosegawa terrane; 砕屑性ジルコン; トリウムーウランー全鉛アイソクロン年代; キ-ワ-ド; 壺ノ沢片麻岩

(1) Precise electron microprobe analysis of monazite and zircon grains has been successful to develop a new dating method: CHIME (Chemical Th-U-total Pb Isochron Method).(2) CHIME ages of detrital monazite grains in Jurassic sandstones of the Mino and Hida terranes concentrate around 1750-1400 Ma, with minor concentrations around 1250, 850 and 250 Ma.(3) CHIME ages of detrital monazites from the Upper Triassic Nabae Group in the Maizuru terrane range largely from ca. 400 to 500 Ma, being much younger than those from the Mino and Hida terranes.(4) Monazite and zircon grains from the Gray Granite, intruding the Hida gneiss in central Japan, yield CHIME ages of ca. 250 Ma; this age is much different from the previously-reported Precambrian Rb-Sr whole-rock age for the Gray Granite.(5) The Tsubonosawa paragneiss included in the Hikami Granite in the South Kitakami terrane yield CHIME zircon ages of 350-2000Ma; rarely some well-rounded zircon grains show an Archean age as old as 3000Ma.This is the first record of Archean detrital zircons from the Japanese Islands.

(1)通过对独居石和锆石的电子探针分析，发展了一种新的测年方法：化学钍-铀-总铅等时线法。(2)Mino和希达岩系侏罗系砂岩中碎屑独居石颗粒的CHIME年龄集中在1750-1400 Ma左右，少数集中在1250、850和250 Ma左右。(3)舞鹤岩中上三叠统Nabae群的碎屑独居石的CHIME年龄范围很大。400 ~ 500 Ma，比美浓和希达的化石年轻得多。(4)侵入日本中部希达片麻岩中的灰色花岗岩中的独居石和锆石颗粒产生的CHIME年龄为约1000年。250 Ma;这一年龄与以前报道的灰色花岗岩的前寒武纪Rb-Sr全岩年龄有很大不同。(5)日本北上南部日上花岗岩中的坪之泽副片麻岩获得350- 2000 Ma的锆石CHIME年龄，个别圆形锆石颗粒显示太古代年龄达3000 Ma，这是日本列岛首次发现太古代碎屑锆石。

项目成果

Kumon, F., Kiminami, K., Adachi, M., Bessho, T., Kawabata, K., Kusunoki, T., Nishimura, T., Okada, H., Okami, K., Suzuki, S. and Teraoka, Y.: "Modal compositions of representative sandstones from the Japanese Islands and their tectonic implications." Mem.

Kumon, F.、Kiminami, K.、Adachi, M.、Bessho, T.、Kawabata, K.、Kusunoki, T.、Nishimura, T.、Okada, H.、Okami, K.、Suzuki, S. 和

Adachi, M., Kojima, S., Wakita, K., Suzuki, K. and Tanaka, T.: "Transect of central Japan: from Hida to Shimanto." In: Adachi,M. and Suzuki,K.(Eds.) 29th IGC Field Trip Guide Book. Vol.1. 143-178 (1992)

Adachi, M.、Kojima, S.、Wakita, K.、Suzuki, K. 和 Tanaka, T.：“日本中部横断面：从飞騨到四万十”。

Suzuki, K. and Adachi, M.: "The chemical Th-U-total Pb isochron ages of zircon and monazite from the Gray Granite of the Hida terrane, Japan." Jour.Earth Sci., Nagoya Univ.38. 11-37 (1991)

Suzuki, K. 和 Adachi, M.：“日本飞弹地体灰色花岗岩中锆石和独居石的化学 Th-U-总 Pb 等时线年龄。”

Adachi, M. and Shibata, K.: "A 254-Ma-old metagabbro intruding the Arakigawa Formation from the circum-Hida terrane, central Japan." Jour.Earth Sci., Nagoya Univ.38. 39-48 (1991)

Adachi, M. 和 Shibata, K.：“一种距今 254 Ma 的变辉长岩，从日本中部飞騨地体周围侵入荒木川组。”

Suzuki,K.and Adachi,M.and Tanaka,T.: "Middle Precambrian provenance of Jurassic sandstone in the Mino terrane,central Japan:ThーUーtotal Pb evidence from an electron microprobe monazite study" Sediment.Geol.75. 141-147 (1991)

Suzuki, K.、Adachi, M. 和 Tanaka, T.：“日本中部美浓地体侏罗纪砂岩的中前寒武纪物源：来自电子微探针独居石研究的 Th-U-总铅证据”Sediment.Geol.75。 141-147（1991）