Chemical composition and age of magmatic rocks from the underwater Hokkaido Rise
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| Auteurs principaux: | , , , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1983
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| _version_ | 1867168559371649024 |
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| author | Sergeev, K F Krasnii, M L Neverov, Yul Ostapenko, V F |
| author_facet | Sergeev, K F Krasnii, M L Neverov, Yul Ostapenko, V F |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Geological and geophysical investigations carried out within the Hokkaido Rise showed that intrusives composing outcrops of the crystalline basement on the ocean floor form a continuous series from monzonites and diorite-monzonites to granites with prevalence of granodiorites with stable mineralogical association: biotite - hornblende - K-feldspar. Acidic volcanic rocks are characterized by a similar mineralogical association with almost complete absence of plagioclase-pyroxene species. It seems that the Hokkaido Rise, as well as the marginal oceanic Zenkevich swell as a whole are not primary oceanic structural formations and have undergone a complex and long history of geological development with intense orogenic movements that occurred in Middle Cretaceous and preceded subalkaline basalt outpouring during postorogenic subsidence of the Earth crust. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_775946 |
| institution | PANGAEA |
| language | en |
| publishDate | 1983 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Chemical composition and age of magmatic rocks from the underwater Hokkaido Rise Sergeev, K F Krasnii, M L Neverov, Yul Ostapenko, V F Archive of Ocean Data; ARCOD; Dredge; DRG; Northwest Pacific; Pegas-80-2143; Pegas-80-2145 Geological and geophysical investigations carried out within the Hokkaido Rise showed that intrusives composing outcrops of the crystalline basement on the ocean floor form a continuous series from monzonites and diorite-monzonites to granites with prevalence of granodiorites with stable mineralogical association: biotite - hornblende - K-feldspar. Acidic volcanic rocks are characterized by a similar mineralogical association with almost complete absence of plagioclase-pyroxene species. It seems that the Hokkaido Rise, as well as the marginal oceanic Zenkevich swell as a whole are not primary oceanic structural formations and have undergone a complex and long history of geological development with intense orogenic movements that occurred in Middle Cretaceous and preceded subalkaline basalt outpouring during postorogenic subsidence of the Earth crust. |
| title | Chemical composition and age of magmatic rocks from the underwater Hokkaido Rise |
| topic | Archive of Ocean Data; ARCOD; Dredge; DRG; Northwest Pacific; Pegas-80-2143; Pegas-80-2145 |
| url | https://doi.org/10.1594/PANGAEA.775946 |