書誌事項
- タイトル別名
-
- Stratigraphy and radiolarian ages of stratiform manganese deposits from the Chichibu Belt in the Saiki area, eastern Oita Prefecture, Japan
- オオイタケン トウブ サエキ チイキ ノ チチブタイ ニ サンスル ソウジョウ マンガン コウショウ ノ ソウ ジョ ト ホウサンチュウ カセキ ネンダイ
この論文をさがす
抄録
Stratiform manganese deposits are present in Triassic to Jurassic bedded chert sequences of the Chichibu Belt in southwest Japan, which are considered to have accumulated in a mid-ocean basin of the Panthalassa Ocean. To constrain the age and depositional setting of these deposits, we have investigated the field geology, stratigraphy, and age of chert-hosted manganese deposits (Takahira, Takahama, and Kubodomari) from the Chichibu Belt in the Saiki area, Oita Prefecture. The stratiform manganese ores range in thickness from 80 to 150 cm and are intercalated with bedded chert. The age of the deposits is constrained by the presence of radiolarian fossils in the associated bedded chert. The red-bedded chert above the Takahira manganese ores contains Late Triassic (Carnian) radiolarian fossils, including Trialatus longicornutus, Trialatus megacornutus, and Enoplocampe yehae. In contrast, radiolarian fossils from the Takahama and Kubodomari deposits occur in stratiform manganese ores of Early Jurassic age (possibly Toarcian), based on the occurrence of Parvicingula nanoconica with Parahsuum and Trillus species. These results suggest that two manganese ore forming events occurred in the pelagic Panthalassa Ocean during the Late Triassic and Early Jurassic.
収録刊行物
-
- 地質学雑誌
-
地質学雑誌 122 (6), 267-273, 2016-06-15
一般社団法人 日本地質学会
- Tweet
詳細情報 詳細情報について
-
- CRID
- 1390001206241926912
-
- NII論文ID
- 130005253517
-
- NII書誌ID
- AN00141768
-
- ISSN
- 13499963
- 00167630
-
- NDL書誌ID
- 027544833
-
- 本文言語コード
- ja
-
- データソース種別
-
- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
-
- 抄録ライセンスフラグ
- 使用不可
