scholarly journals Permian Triassic geologic evolution in the southern Kitakami Belt, Japan

1992 ◽  
Vol 6 ◽  
pp. 155-155
Author(s):  
Kotaro Kamada
Keyword(s):  
Middle Triassic ◽  
Sedimentary Basin ◽  
Tectonic Setting ◽  
Japan Sea ◽  
Passive Margin ◽  
Middle Permian ◽  
Asian Continent ◽  
Transform Faults ◽  
Magmatic Arc ◽  
The Japan Sea

Before opening of the Japan Sea, the Japanese islands were attached to the eastern margin of the Asian continent. The Southern Kitakami Belt is regarded as a micro-continent in an accretional complex of the islands, that accreted before the Early Cretaceous. But its tectonic setting and location between the belt and the Asian continent is still an unresolved argument.Permo-Triassic sequences in the Southern Kitakami Belt are composed of shallow to off-shore deposits. These deposits are composed of clastics, carbonates with volcaniclastics. But there was no volcanic activity in the belt in the Middle to Late Permian. From the viewpoint of the sedimentary character and history, the Middle Permian to Middle Triassic sequences differ from their previous and their following successions in the belt. And the sedimentary basin of Middle Permian to Middle Triassic was bounded by transform faults. Magmatic arc was replaced by passive margin as hinterland of the Southern Kitakami Belt during the Middle Permian to Middle Triassic. It means that the sedimentary basin moved from the margin of Yangtze Platform to Sino-Korean Platform at that time.

Provenance and tectonic setting of the Triassic clastic deposits in the Napo basin, South China: evidence from petrography, whole-rock geochemistry and detrital zircon U–Pb geochronology

2021 ◽  
pp. 1-20
Author(s):  
Lei Xia ◽  
Quan-Ren Yan ◽  
Zhong-Jin Xiang ◽  
Hong-Bo Zheng ◽  
Quan-Lin Hou ◽  
...  
Keyword(s):  
South China ◽  
Detrital Zircon ◽  
Middle Triassic ◽  
Tectonic Setting ◽  
Detrital Zircons ◽  
Island Arc ◽  
Late Permian ◽  
Magmatic Arc ◽  
Clastic Rocks ◽  
Arc Setting

Abstract The provenance and tectonic setting of the Lower–Middle Triassic clastic sediments from the Napo basin, South China, have been examined here using detrital modes, whole-rock geochemistry and detrital zircon U–Pb ages. Field investigations indicate that these sediments consist of fan delta, slope and turbidity fan facies with dominantly southward palaeocurrent directions. Detrital modes and geochemical characteristics of the clastic rocks indicate that they were derived from mixed magmatic arc and Palaeozoic successions in a continental island arc setting, with no significant sediment recycling. The U–Pb age spectra of sandstone detrital zircons from different stratigraphic positions are similar, with one major group (300–230 Ma), two subordinate groups (400–320 Ma and 480–420 Ma, respectively) and two scattered groups (1200–800 Ma and 2000–1700 Ma, respectively). Thus, we consider that the north late Permian – Middle Triassic volcanic rocks and the uplifted Palaeozoic sedimentary/volcanic sequences constituted the predominant sources. The detritus derived from the late Permian Emeishan mafic rocks is subordinate and limited. The pre-Devonian zircons are likely sedimentary-recycled or magmatic-captured instead of directly derived from the early Palaeozoic orogen (e.g. Yunkai massif) and Neoproterozoic Jiangnan orogen because of the topographic barrier of a magmatic arc and carbonate platform. Considering the spatial and temporal distribution characteristics of the volcanic arc and ophiolite, we suggest that the Triassic Napo basin was a fore-arc basin within a continental island arc setting, which developed in response to the northward subduction of the Babu–Cao Bang branch ocean beneath the South China Block.

Some Aspects of Japan Sea Trade in the Tokugawa Period

1964 ◽  
Vol 23 (3) ◽  
pp. 405-416 ◽  
Author(s):  
Robert G. Flershem
Keyword(s):  
Seventeenth Century ◽  
Japan Sea ◽  
Permanent Residence ◽  
Tokugawa Period ◽  
The Japan Sea

It is reasonable to assume that Kaga han, in view of its size, large rice and other exports, and central coastal location, provided the lion's share of ships and shipowners operating in the Japan Sea during the two centuries before Perry. Villagers were going from Noto to North Honshu and Hokkaido both for temporary occupation and for permanent residence in the mid-seventeenth century and diereafter; and some of these emigrants became useful Kaga han trade agents. Moreover, transport of rice and salt respectively to Tsuruga and Echigo from Noto villages early in the Tokugawa period can be documented. Kaga han needed an all-water route to Osaka because of the high cost of transshipping rice by land from Tsuruga to Osaka. This may have been the main reason for the development in the latter part of the seventeenth century of nishi mawari, the route for ships going from the Japan Sea through the Inland Sea.

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