Abstract
The rock distribution resulted from the bimodal volcanism during the Daijima-Nishikurosawa Stage (Middle Miocene) shows acidic rocks which are dominant in the inland of the Tohoku District and basaltic rocks which are overwhelming in the oil fields along the coastal area of the Sea of Japan in the same district and its thickness exceeds 1,000m. The basaltic rocks are mainly the result of igneous activities in the seabottom behind the island arc at that time, but at the present, most of them are covered with thick sediment. Besides, the above basaltic rocks share many common features with the volcanic rocks in the basin behind the arc in terms of their distribution and chemical composition. This basaltic rocks consist mainly of slightly altered tholeiite basalt and in the southern part of the study area, show seemingly an increment of alkali contents toward the inland. Furthermore, its composition of major ingredients shows the intermediate feature between the island arc tholeiite and the backarc basin basalt from the viewpoint of the alteration trend and the scale value of FeO/MgO. (12 figs, 2 tabs, 61 refs)
Citation Formats
Tsuchiya, Nobuyuki.
Distribution and chemical composition of the middle miocene basaltic rocks in Akita-Yamagata oil fields of northeastern Japan.
Japan: N. p.,
1988.
Web.
Tsuchiya, Nobuyuki.
Distribution and chemical composition of the middle miocene basaltic rocks in Akita-Yamagata oil fields of northeastern Japan.
Japan.
Tsuchiya, Nobuyuki.
1988.
"Distribution and chemical composition of the middle miocene basaltic rocks in Akita-Yamagata oil fields of northeastern Japan."
Japan.
@misc{etde_6776841,
title = {Distribution and chemical composition of the middle miocene basaltic rocks in Akita-Yamagata oil fields of northeastern Japan}
author = {Tsuchiya, Nobuyuki}
abstractNote = {The rock distribution resulted from the bimodal volcanism during the Daijima-Nishikurosawa Stage (Middle Miocene) shows acidic rocks which are dominant in the inland of the Tohoku District and basaltic rocks which are overwhelming in the oil fields along the coastal area of the Sea of Japan in the same district and its thickness exceeds 1,000m. The basaltic rocks are mainly the result of igneous activities in the seabottom behind the island arc at that time, but at the present, most of them are covered with thick sediment. Besides, the above basaltic rocks share many common features with the volcanic rocks in the basin behind the arc in terms of their distribution and chemical composition. This basaltic rocks consist mainly of slightly altered tholeiite basalt and in the southern part of the study area, show seemingly an increment of alkali contents toward the inland. Furthermore, its composition of major ingredients shows the intermediate feature between the island arc tholeiite and the backarc basin basalt from the viewpoint of the alteration trend and the scale value of FeO/MgO. (12 figs, 2 tabs, 61 refs)}
journal = []
volume = {94:8}
journal type = {AC}
place = {Japan}
year = {1988}
month = {Aug}
}
title = {Distribution and chemical composition of the middle miocene basaltic rocks in Akita-Yamagata oil fields of northeastern Japan}
author = {Tsuchiya, Nobuyuki}
abstractNote = {The rock distribution resulted from the bimodal volcanism during the Daijima-Nishikurosawa Stage (Middle Miocene) shows acidic rocks which are dominant in the inland of the Tohoku District and basaltic rocks which are overwhelming in the oil fields along the coastal area of the Sea of Japan in the same district and its thickness exceeds 1,000m. The basaltic rocks are mainly the result of igneous activities in the seabottom behind the island arc at that time, but at the present, most of them are covered with thick sediment. Besides, the above basaltic rocks share many common features with the volcanic rocks in the basin behind the arc in terms of their distribution and chemical composition. This basaltic rocks consist mainly of slightly altered tholeiite basalt and in the southern part of the study area, show seemingly an increment of alkali contents toward the inland. Furthermore, its composition of major ingredients shows the intermediate feature between the island arc tholeiite and the backarc basin basalt from the viewpoint of the alteration trend and the scale value of FeO/MgO. (12 figs, 2 tabs, 61 refs)}
journal = []
volume = {94:8}
journal type = {AC}
place = {Japan}
year = {1988}
month = {Aug}
}