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Ground motion characteristics and the depth of the S-wave velocity discontinuity in the post-LGM incised-valley fills beneath the Tokyo Bay area, central Japan, based on microtremor surveys 基于微震测量的日本中部东京湾地区lgm后切谷填充物地面运动特征和s波速度不连续深度
The Journal of the Geological Society of Japan Pub Date : 2022-01-15 DOI: 10.5575/geosoc.2022.0002
J. Komatsubara, I. Cho, K. Sakata, T. Nakazawa
{"title":"Ground motion characteristics and the depth of the S-wave velocity discontinuity in the post-LGM incised-valley fills beneath the Tokyo Bay area, central Japan, based on microtremor surveys","authors":"J. Komatsubara, I. Cho, K. Sakata, T. Nakazawa","doi":"10.5575/geosoc.2022.0002","DOIUrl":"https://doi.org/10.5575/geosoc.2022.0002","url":null,"abstract":"The average S-wave velocity and peak frequency of the microtremor H/V spectrum, or the resonance frequency of the ground, were estimated at 16 sites in the Tokyo Lowland along the coast of inner part of Tokyo Bay, central Japan. The results indicate that the resonance frequencies become lower with an increase in thickness of the post-Last Glacial Maximum (LGM) deposits. The post-LGM deposits are divided into the lower Nanagochi Formation and the upper Yurakucho Formation in the Tokyo Lowland. The depth of the S-wave velocity discontinuity, which determines the resonance frequency of the ground, was calculated by applying the quarter-wavelength law. At 7 of the 13 microtremor observation points examined (i.e., 3 points on a buried flat surface are excluded from the examination), the S-wave velocity discontinuity is located within alternating layers of sand and mud in the Nanagochi Formation, even though the boundary between the Nanagochi and Yurakucho formations has conven-tionally been considered the most significant boundary in terms of physical properties in the post-LGM deposits. This discrepancy is perhaps caused by the strong influence of either the lithologic bound aries in the alternatin layers of sand and mud in the upper part of the Nanagochi Formation, or the more conspicuous boundary at the top of the basal gravels of the Nanagochi Formation, or both. The variations in the peak frequency of the H/V spectrum are caused by the heterogeneity of meandering river and estuary deposits in the Formation.","PeriodicalId":444224,"journal":{"name":"The Journal of the Geological Society of Japan","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130675498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Kasimovian (Late Pennsylvanian) conodont fauna from a limestone block in the Ōtani Formation, Kuzuryu area of the Hida Gaien belt, Fukui Prefecture, central Japan 日本中部福井县飞田湾带Kuzuryu地区Ōtani组石灰岩块中的Kasimovian(晚宾夕法尼亚)牙形石动物群
The Journal of the Geological Society of Japan Pub Date : 2022-01-15 DOI: 10.5575/geosoc.2022.0005
Yui Takahashi, Yuichi Fukushima, G. Tanaka, Yukio Miyake
{"title":"Kasimovian (Late Pennsylvanian) conodont fauna from a limestone block in the Ōtani Formation, Kuzuryu area of the Hida Gaien belt, Fukui Prefecture, central Japan","authors":"Yui Takahashi, Yuichi Fukushima, G. Tanaka, Yukio Miyake","doi":"10.5575/geosoc.2022.0005","DOIUrl":"https://doi.org/10.5575/geosoc.2022.0005","url":null,"abstract":": A conodont fauna characterized by Streptognathodus species was recovered from a limestone block (previously called Ō boradani Formation) of the Ō tani (=Ohtani or Otani) Formation belonging to the Hida Gaien belt distributed in the Kuzuryu area, Fukui Prefecture, central Japan. The fauna consists of Streptognathodus corrugatus , S. elegantulus , S. excelsus , S. gracilis , Idiognathodus sp., Gondolella bella , G . cf. elegantula and G . cf. pohli . These streptognathodids have a wide geographic distribution and indicate a middle–late Kasimovian (Late Pennsylvanian) age, which is slightly older than the Gzhelian (latest Pennsylvanian) age infferred from fusulinid fossils in previ ous studies.","PeriodicalId":444224,"journal":{"name":"The Journal of the Geological Society of Japan","volume":"215 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116304204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Newly found fault outcrops of the Tsuruga fault in the Mihama Town, Fukui Prefecture, Japan 日本福井县三滨镇鹤贺断层新发现的断层露头
The Journal of the Geological Society of Japan Pub Date : 2022-01-15 DOI: 10.5575/geosoc.2022.0007
Ryou Tateishi, K. Shimada, A. Iwamori, Shin-ya Wada, Shotaro Seno, Ken Nagata
{"title":"Newly found fault outcrops of the Tsuruga fault in the Mihama Town, Fukui Prefecture, Japan","authors":"Ryou Tateishi, K. Shimada, A. Iwamori, Shin-ya Wada, Shotaro Seno, Ken Nagata","doi":"10.5575/geosoc.2022.0007","DOIUrl":"https://doi.org/10.5575/geosoc.2022.0007","url":null,"abstract":"","PeriodicalId":444224,"journal":{"name":"The Journal of the Geological Society of Japan","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115177974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tectonic property of late Paleozoic garnet-bearing high-P/T schist at the boundary between the Nedamo and North Kitakami belts, NE Japan 日本东北部内达摩带与北北上带交界处晚古生代含石榴石高磷/T片岩的构造性质
The Journal of the Geological Society of Japan Pub Date : 2022-01-10 DOI: 10.5575/geosoc.2021.0034
Takayuki Uchino, Y. Banno
{"title":"Tectonic property of late Paleozoic garnet-bearing high-P/T schist at the boundary between the Nedamo and North Kitakami belts, NE Japan","authors":"Takayuki Uchino, Y. Banno","doi":"10.5575/geosoc.2021.0034","DOIUrl":"https://doi.org/10.5575/geosoc.2021.0034","url":null,"abstract":": An exotic block of garnet-bearing schist has been found at the boundary between the Early Triassic Takinosawa Unit of the Nedamo Belt and the Early Jurassic Nakatsugawa Complex of the North Kitakami Belt, NE Japan. This is only the second discovery of exotic schists in the Nedamo Belt; the previously identi-fied schists occur at the boundary between the Takino sawa and early Carboniferous Tsunatori units of the Nedamo Belt. The garnet-bearing schist is character-ized by a mineral assemblage of garnet + phengite + epidote + albite + quartz + titanite. Phengite with Si of 6 . 51 – 6 . 66 atoms per formula unit (O = 22 ) and the mineral assemblage suggest that the schist underwent high- P/T metamorphism prior to emplacement into its current position. The schist yields a phengite K–Ar age of ca. 290 Ma (late Paleozoic), suggesting a correlation with high- P/T schist of the Yamagami Metamorphic Rocks from the Motai–Matsugadaira Belt. This finding supports the extension of late Paleozoic high- P/T metamorphic rocks (i.e., the Renge Belt of SW Japan) to NE Japan.","PeriodicalId":444224,"journal":{"name":"The Journal of the Geological Society of Japan","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132664916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Zn-poor hercynite in felsic gneiss from the Yodoe area, Tottori Prefecture, Japan 日本鸟取县Yodoe地区长质片麻岩中的贫锌海尖晶石
The Journal of the Geological Society of Japan Pub Date : 2021-12-15 DOI: 10.5575/geosoc.2021.0033
S. Endo, Sotaro Mori
{"title":"Zn-poor hercynite in felsic gneiss from the Yodoe area, Tottori Prefecture, Japan","authors":"S. Endo, Sotaro Mori","doi":"10.5575/geosoc.2021.0033","DOIUrl":"https://doi.org/10.5575/geosoc.2021.0033","url":null,"abstract":": Gneissose rocks exposed at the Yodoe area, northwestern flank of Mt. Daisen, Tottori Prefecture have been considered as western extension of the Hida metamorphic rocks in the Hida Mountains. We de-scribe a new occurrence of hercynite [(Fe 2 + ,Mg,Zn,Mn) (Al,Fe 3 + ) 2 O 4 ] in garnet-bearing felsic gneiss from the Yodoe area. Green hercynite occurs exclusively as in-clusions in garnet, and is not in direct contact with quartz. The Fe 2 + /(Fe 2 + + Mg + Zn + Mn) and Al/(Al + Fe 3 + ) values of the hercynite are 0 . 84 – 0 . 85 and 0 . 91 – 0 . 92 , respectively. The hercynite is characterized by low ZnO content ( 2 . 21 – 2 . 41 wt%).","PeriodicalId":444224,"journal":{"name":"The Journal of the Geological Society of Japan","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134261512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An example of heavy liquid separation using SPT: 使用SPT进行重液分离的一个例子:
The Journal of the Geological Society of Japan Pub Date : 2021-12-15 DOI: 10.5575/geosoc.2021.0032
Kantato Fujiwara, S. Yamasaki, Hiroki Nagatsuka
{"title":"An example of heavy liquid separation using SPT:","authors":"Kantato Fujiwara, S. Yamasaki, Hiroki Nagatsuka","doi":"10.5575/geosoc.2021.0032","DOIUrl":"https://doi.org/10.5575/geosoc.2021.0032","url":null,"abstract":": Well-crystallized groundmass fractions are commonly used to obtain reliable K–Ar ages for volcanic rocks, as phenocrysts potentially contain excess 40 Ar.","PeriodicalId":444224,"journal":{"name":"The Journal of the Geological Society of Japan","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121909535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Fluid source of seismogenic accretionary body based on calcite isotope ratio, Shimanto complex, Shikoku, southwest Japan 基于方解石同位素比值的日本西南四国岛满杂岩发震增生体流体来源
The Journal of the Geological Society of Japan Pub Date : 2021-12-15 DOI: 10.5575/geosoc.2021.0031
Natsuki Uchida, M. Murayama, Y. Matsubara, A. Sakaguchi
{"title":"Fluid source of seismogenic accretionary body based on calcite isotope ratio, Shimanto complex, Shikoku, southwest Japan","authors":"Natsuki Uchida, M. Murayama, Y. Matsubara, A. Sakaguchi","doi":"10.5575/geosoc.2021.0031","DOIUrl":"https://doi.org/10.5575/geosoc.2021.0031","url":null,"abstract":"The Shimanto accretionary complex in Shikoku, which was ex-humed from seismogenic depths, contains many calcite veins. These veins may be studied to better understand the origin of various fluids in the deep sections of a subduction zone. For example, fluid sources may be inferred from comparison of the isotopic ratio of the calcite and its depositional temperature. This study obtained δδ 18 O VPDB and δδ 13 C VPDB measurements from 74 samples of calcite veins in the Yokonami Melange and surrounding rocks, which had been exposed to peak temperatures of 140 ° C to 250 ° C, comparable to seismogenic thermal conditions in the Nankai subduction zone. The study results show that the isotopic ratio of calcite is related to the paleo-temperature of the host rock. The lowest δδ 13 C VPDB value for calcite from several measurements obtained for a single location is dependent on the paleo-temperature of the host rock. In addition, the calcite samples from the higher paleo-temperature areas have the lowest δδ 13 C VPDB values. This suggests that crack-seal veins acted as conduits for fluid flow at various stages, and calcite samples with the lowest δδ 13 C VPDB values in an area were deposited during the peak tem-perature stage. The fluid source of calcite may be inferred from δδ 18 O SMOW values and depositional temperature. It is revealed that the calcite veins might be deposited from metamorphic fluid. This im-plies that in-situ fluid flows within the main body of the accretionary prism, free of exotic fluid from shallow or deep sections along the plate boundary fault.","PeriodicalId":444224,"journal":{"name":"The Journal of the Geological Society of Japan","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116224423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Re-examination of the lithostratigraphy of Hokusetsu Subgroup in the southeastern part of the Miocene Shidara basin, eastern Aichi Prefecture, central Japan: Proposal of the Umedaira Sandstone Member 日本爱知县东部中新世志达拉盆地东南部北越亚群岩石地层学的再考察:梅德拉砂岩段的建议
The Journal of the Geological Society of Japan Pub Date : 2021-11-15 DOI: 10.5575/geosoc.2021.0027
Sakurako Yabuta, M. Takeuchi
{"title":"Re-examination of the lithostratigraphy of Hokusetsu Subgroup in the southeastern part of the Miocene Shidara basin, eastern Aichi Prefecture, central Japan: Proposal of the Umedaira Sandstone Member","authors":"Sakurako Yabuta, M. Takeuchi","doi":"10.5575/geosoc.2021.0027","DOIUrl":"https://doi.org/10.5575/geosoc.2021.0027","url":null,"abstract":"©The Geological Society of Japan 2021 673 Abstract: The Hokusetsu Subgroup in the eastern Shidara basin, eastern Aichi Prefecture, central Japan, is the lower part of the Miocene Shidara Group. In ascending stratigraphic order, the subgroup consists of the Kawakado, Shimoda, Tsubosawa, and Kuroze formations, which formed during a continuous transgression. Re-examination of the lithostratigraphy of the Hokusetsu Subgroup in the eastern Shidara basin has revealed a thick sandstone formation in the upper part of the Shimoda Formation, which otherwise consists mainly of mudstone. The sandstone beds, which had previously been considered part of the Kawakado Formation, clearly extend to the north where they interfinger with the mudstone of the Shimoda Formation. The existence of these newly identified sandstone beds in the Shimoda Formation, named the Umedaira Sandstone Member, suggests that the Hokusetsu Subgroup formed not only by simple transgression, but also by the influence of tectonic movements. The Umedaira Sandstone Member may be the key to clarifying Miocene tectonics in the Shidara Basin. レター","PeriodicalId":444224,"journal":{"name":"The Journal of the Geological Society of Japan","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133406350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Jurassic natural gas reservoir in the North West Shelf of Australia 澳大利亚西北陆架侏罗系天然气储层
The Journal of the Geological Society of Japan Pub Date : 2021-11-15 DOI: 10.5575/geosoc.2021.0024
K. Yamamoto, T. Jones
{"title":"Jurassic natural gas reservoir in the North West Shelf of Australia","authors":"K. Yamamoto, T. Jones","doi":"10.5575/geosoc.2021.0024","DOIUrl":"https://doi.org/10.5575/geosoc.2021.0024","url":null,"abstract":"低炭素社会実現に向けた世界的な取り組みが加速する中,クリー ンエネルギーとしての天然ガスの重要性は大きく高まっている.オー ストラリア北西大陸棚に位置するイクシスガス・コンデンセート田 では、主力貯留層の一つであるジュラ系プローバー層に大規模な天 然ガスの胚胎が確認されており,日本企業の操業主体による生産開 始に向け,実用的な貯留層モデルが構築されている(Yamamoto et al., 2020).同層を貯留層とするガス田は同大陸棚に点在しており, 河川~浅海の多様な堆積物が確認されている.さらに,ゴンドワナ 大陸の分裂に伴うジュラ紀火成岩の貫入・噴出が同貯留層の分布を 複雑にしている.各ガス田で得られているコア試料は断片的な地質 情報であり,実際の貯留層の分布・性状の不確実性を的確に評価す るためには,広域的なコアデータの統合により,プローバー層の堆 積システム・火成作用・埋没続成史を堆積盆スケールで包括的に理 解することが必要不可欠である.","PeriodicalId":444224,"journal":{"name":"The Journal of the Geological Society of Japan","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116283969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Operating outdated EPMA (JXA-8600SX) by popular microcomputers and Windows PC 操作过时的EPMA (JXA-8600SX)流行的微型计算机和Windows PC
The Journal of the Geological Society of Japan Pub Date : 2021-11-15 DOI: 10.5575/geosoc.2021.0028
H. Ueda, E. Takazawa
{"title":"Operating outdated EPMA (JXA-8600SX) by popular microcomputers and Windows PC","authors":"H. Ueda, E. Takazawa","doi":"10.5575/geosoc.2021.0028","DOIUrl":"https://doi.org/10.5575/geosoc.2021.0028","url":null,"abstract":"","PeriodicalId":444224,"journal":{"name":"The Journal of the Geological Society of Japan","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127157053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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