Preliminary CHIME dating of granites from the Nkambe area, northwestern Cameroon, Africa
この論文をさがす
説明
The chemical Th-U-total Pb isochron method (CHIME) has been adopted for dating the syntectonic foliated and post-tectonic unfoliated granites in northwestern Cameroon. The CHIME ages are 532±35 Ma for allanite and 523±45 Ma for zircon from Sample I_<10> of foliated biotite granite, 530±9 Ma for monazite from Sample N_9 of foliated two-mica granite, and 510±25 Ma for monazite from Sample I_4 of unfoliated two-mica granite. Several monazite grains from Samples N_9 and I_4 yield 436±13 and 420±16 Ma CHIME ages, respectively. The 532-510 Ma ages are interpreted as the time of granite emplacement and the 436-420 Ma ages as the time of hydrothermal alteration. The CHIME ages coupled with the concordant relation between the foliated granites and migmatitic gneiss suggest a ca. 530 Ma metamorphic-plutonic episode in northwestern Cameroon rather than a thermal overprint by granite intrusion.
収録刊行物
-
- The Journal of earth and planetary sciences, Nagoya University
-
The Journal of earth and planetary sciences, Nagoya University 46 57-70, 1999-12
Dept. of Earth and Planetary Sciences, Nagoya University
- Tweet
詳細情報 詳細情報について
-
- CRID
- 1390009224404311296
-
- NII論文ID
- 110000030667
-
- NII書誌ID
- AA10931903
-
- HANDLE
- 2237/2847
-
- ISSN
- 0919875X
-
- 本文言語コード
- en
-
- 資料種別
- departmental bulletin paper
-
- データソース種別
-
- JaLC
- IRDB
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用可