https://scholars.lib.ntu.edu.tw/handle/123456789/431810
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.author | Mateen T. | en_US |
dc.contributor.author | Okamoto K. | en_US |
dc.contributor.author | SUN-LIN CHUNG | en_US |
dc.contributor.author | Wang K.-L. | en_US |
dc.contributor.author | Lee H.-Y. | en_US |
dc.contributor.author | Abe S. | en_US |
dc.contributor.author | Mita Y. | en_US |
dc.contributor.author | Rehman H.U. | en_US |
dc.contributor.author | Terabayashi M. | en_US |
dc.contributor.author | Yamamoto, Hiroshi | en_US |
dc.creator | Mateen T.;Okamoto K.;Chung S.-L.;Wang K.-L.;Lee H.-Y.;Abe S.;Mita Y.;Rehman H.U.;Terabayashi M.;Yamamoto H. | - |
dc.date.accessioned | 2019-11-20T08:40:04Z | - |
dc.date.available | 2019-11-20T08:40:04Z | - |
dc.date.issued | 2019 | - |
dc.identifier.issn | 12264806 | - |
dc.identifier.uri | https://scholars.lib.ntu.edu.tw/handle/123456789/431810 | - |
dc.description.abstract | U-Pb-Hf isotopes of zircons from the granitic intrusive rocks in the Iwakuni area of Southwest Japan are determined by LA-ICP-MS analysis. The Gamano Granodiorite belonging to the Older Ryoke Granites of the Ryoke Belt yielded U-Pb mean age of 92.3 ¡Ó 2.6 Ma (MSWD = 1.8). The Namera Granite belonging to the Younger Ryoke Granites of the Ryoke Belt yielded U-Pb mean age of 106.3 ¡Ó 1.6 Ma (MSWD = 2.3). The Shimokuhara Granite belonging to the Hiroshima Granites of the San-yo Belt yielded U-Pb mean age of 103.8 ¡Ó 1.5 Ma (MSWD = 0.32). A granite porphyry sample taken from about 15 m thick dike discordantly intruded into pelitic schist of the Ryoke metamorphic rocks yielded U-Pb mean age of 92.5 ¡Ó 1.6 Ma (MSWD = 0.63). Hf isotope data, obtained from the same dated zircon grains, show initial 176Hf/177Hf isotopic ratios referred to as ¡§£`Hf(t)¡¨ generally ranging between¡V4.8 and +1.1 except an anomalously low value (¡V15.0) from an inherited core. The £`Hf(t) values, calculated with average crustal 176Lu/177Hf ratio of 0.015, correspond to Hf isotope crustal model ages between 1474 to 1087 Ma (Mesoproterozoic). The Gamano Graodiorite has long been regarded to be a syn-tectonic intrusion, but the zircon ages and £`Hf(t) values are similar to those of the post-tectonic granite porphyry dike. The results of this study together with available U-Pb zircon ages of granitic rocks in the Iwakuni area reported elsewhere reveal that the order of emplacement indicated by the U-Pb zircon ages are much discrepant with the traditional classification, the Older Ryoke, the Younger Ryoke. It is better to refrain from the use of ¡§Older¡¨ and ¡§Younger¡¨ for the collective names of the granitic intrusive bodies. ? 2019, The Association of Korean Geoscience Societies and Springer. | - |
dc.language | English | - |
dc.relation.ispartof | Geosciences Journal | - |
dc.subject | granitic rocks | - |
dc.subject | Hf isotope | - |
dc.subject | Ryoke Belt | - |
dc.subject | San-yo Belt | - |
dc.subject | U-Pb age | - |
dc.title | LA-ICP-MS zircon U-Pb age and Hf isotope data from the granitic rocks in the Iwakuni area, Southwest Japan: re-evaluation of emplacement order and the source magma | en_US |
dc.type | journal article | en |
dc.identifier.doi | 10.1007/s12303-019-0003-1 | - |
dc.identifier.scopus | 2-s2.0-85073534881 | - |
dc.identifier.url | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073534881&doi=10.1007%2fs12303-019-0003-1&partnerID=40&md5=3069e6287a56e2df684722c0f9341f01 | - |
dc.relation.pages | 917-931 | - |
dc.relation.journalvolume | 23 | - |
dc.relation.journalissue | 6 | - |
item.openairecristype | http://purl.org/coar/resource_type/c_6501 | - |
item.openairetype | journal article | - |
item.grantfulltext | none | - |
item.cerifentitytype | Publications | - |
item.fulltext | no fulltext | - |
crisitem.author.dept | Geosciences | - |
crisitem.author.orcid | 0000-0002-5362-4496 | - |
crisitem.author.parentorg | College of Science | - |
顯示於: | 地質科學系 |
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