Stratigraphic correlation of Cretaceous non-marine sedimentary basins of Southeast Korea and Southwest Japan

韩国东南部和日本西南部白垩纪非海相沉积盆地地层对比

• 批准号: 06044254
• 负责人: ADACHI Mamoru
• 金额: --
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Overseas Scientific Survey.
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06044254/
• 关键词: Korean Peninsula; Cretaceous non-marine sediments; Kyongsang Group; Okchon belt; CHIME age; Clastic monazite; Chert clasts; Precambrian gneiss

Cretaceous non-marine sedimentary rocks called the Kyongsang Group are widespread in the southeastern Korean Peninsula. The following results were obtained from this research.(1) The Kyongsang Group in the Yongyang area that occupies the northern part of the Kyongsang Basin consists mainly of sandstone, conglomerate and red siltstone. The conglomerate, although very rare, contains chert clasts in some horizons. Several chocolate brown chert clasts yielded well-preserved permian radiolarians of the Follicucullus group.(2) The matrix sandstone of the above Cretaceous conglomerate contains such heavy minerals of tourmaline, opaques, zircon and monazite. The detrital monazites yielded CHIME ages of ca.1500 Ma of middle Proterozoic age and ca.250 Ma of Permian-Triassic boundary age.(3) Black phyllite and schist in the Okchon Belt to the southeast of Chunju sporadically contain clasts of quartzite, granitoid, marl and limestone. The granitic gneiss clasts yielded CHIME monazite ages of 1450 Ma, suggesting that middle Proterozoic granite and gneiss were present in the provenance of Okchon clastic rocks.(4) The Okchon metamorphic rocks exposed near the Chunju dam consist of metabasite, dolomite, quartzite and metapelite. Garnet-bearing actinolite-epidote schist of basaltic tuff origin contains allanite that yields CHIME ages of ca.250 Ma. This age probably represents the time of regional metamorphism of the Okchon schists.

被称为庆尚群的白垩纪非海相沉积岩在韩半岛东南部分布广泛。本研究得到以下结果：(1)位于庆尚盆地北部的永阳地区的庆尚群主要由砂岩、砾岩和红粉砂岩组成。该砾岩虽然非常罕见，但在某些层位含有燧石碎屑。几块巧克力棕色燧石碎屑产生了保存完好的二叠纪放射虫，属于卵泡群。(2)上述白垩系砾岩基质砂岩中含有电气石、不透明石、锆石、独居石等重质矿物。碎屑独居石的CHIME年龄为中元古代约1500 Ma，二叠纪-三叠纪界线年龄约250 Ma。(3)春州东南玉川带黑色千粒岩和片岩中零星含有石英岩、花岗质、泥灰岩和灰岩等碎屑。花岗质片麻岩碎屑产生的CHIME独居岩年龄为1450 Ma，表明玉川碎屑岩物源中存在中元古代花岗质和片麻岩。(4)春州坝附近裸露的玉川变质岩由变质岩、白云岩、石英岩和变质长岩组成。产于玄武岩凝灰岩的含石榴石的放线石绿帘石片岩中含有约250 Ma CHIME年龄的allanite。这个时代可能代表了玉川片岩的区域变质作用时期。

项目成果

Suzuki, K.and Adachi, M.: "Middle Precambrian detrital monazite and zircon from the Hida gneiss on Oki-Dogo Island, Japan : their origin and implications for the correlation of basement gneiss of Southwest Japan and Korea" Tectonophysics. 235. 277-292 (19

Suzuki, K. 和 Adachi, M.：“来自日本 Oki-Dogo 岛飞弹片麻岩的中前寒武纪碎屑独居石和锆石：它们的起源及其对日本西南部和韩国基底片麻岩相关性的影响”构造物理学。

Adachi, M.and Choi, Sung-Ja: "Discovery of Permian radiolarians from chert clasts in conglomerate of the Cretaceous Kyongsang Group, Korea" Jour.Geol.Soc.Japan. 101 (in preparation). (1995)

Adachi, M. 和 Choi, Sung-Ja：“从韩国白垩纪庆尚群砾岩中的燧石碎屑中发现二叠纪放射虫”Jour.Geol.Soc.Japan。

Adachi,M.and Choi,S.J.: "Discovery of Permian radiolarians from chert clasts in conglomerate of the Kyongsang Group,Korea" Jour.Geol.Soc.Japan. 101(in preparation). (1995)

Adachi,M. 和 Choi,S.J.：“从韩国庆尚集团砾岩中的燧石碎屑中发现二叠纪放射虫”Jour.Geol.Soc.Japan。

Suzuki,K.and Adachi,M.: "Middle Precambrian detrital monazite and zircon from the Hida gneiss on Oki-Dogo Island,Japan:their origin and implications for the correlation of basement gneiss of Southwest Japan and Korea" Tectonophysics. 235. 277-292 (1994)

Suzuki,K. 和 Adachi,M.：“来自日本隐木道后岛飞弹片麻岩的中前寒武纪碎屑独居石和锆石：它们的起源及其对日本西南部和韩国基底片麻岩对比的影响”构造物理学。