| アイテムタイプ |
itemtype_ver1(1) |
| 公開日 |
2025-04-08 |
| タイトル |
|
|
タイトル |
Two types of volcanic rocks in the Bombookhoi Formation, South Gobi Province, Mongolia: A preliminarily report |
|
言語 |
en |
| 著者 |
KHISHIGBADAM, Davgadorj
TSUKADA, Kazuhiro
ERDENEBAYAR, Jamsuren
MANCHUK, Nuramkhaan
|
| アクセス権 |
|
|
アクセス権 |
open access |
|
アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
tholeiitic basalt |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
calc-alkaline andesite |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
volcanic arc |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Late Mesozoic |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Bombookhoi Formation |
| 内容記述 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
The Central Asian Orogenic Belt (CAOB) is the core geologic unit to understand the tectonic history of Eurasian continent. Although the Mesozoic volcanic rocks in the South Mongolia are the key factor in revealing the later stage of the CAOB formation, very few attempt on its geochemistry have been made. This study gives the basic geochemical information of the volcanic rocks of the Bombookhoi Formation, which has been assigned to the “Upper Cretaceous,” of the South Mongolia, and discusses its tectonic setting. The volcanic rocks of the study area are divided into the tholeiitic basalt (SiO2: 46–49 wt%, FeO*/MgO: 6.0–9.0, Mg#: 17–23) and calc-alkaline andesite (SiO2: 54–57 wt%, FeO*/MgO: 1.6–2.6, Mg#: 40–52). Although the both has a signature of volcanic arc environment such as distinctive Nb negative anomaly in the MORB-normalized multi-element concentration diagram, these has probably been derived from the different sources of magma each other judging from FeO*/MgO ratio, Mg#, and others. It is considered that, by the Jurassic, the South Mongolia block and Siberian craton/North China block had already been amalgamated each other to complete the core part of the “East Asia,” and neither oceanic plate subduction nor arc volcanism is assumed to have occurred in the South Mongolia at the Late Cretaceous. Therefore, age-confirmation of this formation, such as by isotopic dating and others, should be required further. Then, if the volcanic rocks of the Bombookhoi Formation are truly Upper Cretaceous, re-consideration for the basic tectonic scheme around the South Mongolia block at Late Cretaceous will be needed. |
|
言語 |
en |
| 出版者 |
|
|
出版者 |
名古屋大学博物館 |
|
言語 |
ja |
| 出版者 |
|
|
出版者 |
Nagoya University Museum |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプresource |
http://purl.org/coar/resource_type/c_6501 |
|
タイプ |
departmental bulletin paper |
| 出版タイプ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| ID登録 |
|
|
ID登録 |
10.18999/bulnum.040.03 |
|
ID登録タイプ |
JaLC |
| 収録物識別子 |
|
|
収録物識別子タイプ |
PISSN |
|
収録物識別子 |
1346-8286 |
| 書誌情報 |
ja : 名古屋大学博物館報告
en : Bulletin of the Nagoya University Museum
巻 40,
p. 19-28,
発行日 2025-03-17
|
bulnum_040_03.pdf (904.6 KB)
