Preliminary report of the Charmo (Jarmo) Prehistoric investigations, 2023


O-Hf isotope ratios of Alvand S-type granite, western Iran, reveal crustal melting in an extensional regime


Crystallization of superfast-spreading oceanic crust (ODP 1256D, Pacific Ocean): Constraints from zircon geochronology


The generation of Eocene mafic dike swarms during the exhumation of a core complex, Biarjmand area, NE Iran


Preliminary report of the Charmo (Jarmo) Prehistoric investigations


Tectonic transition from Ediacaran continental arc to early Cambrian rift in the NE Ardakan region, central Iran: constraints from geochronology and geochemistry of magmatic rocks


A cold seep triggered by a hot ridge subduction

The Chile Triple Junction, where the hot active spreading centre of the Chile Rise system subducts beneath the South American plate, offers a unique opportunity to understand the influence of the anomalous thermal regime on an otherwise cold continental margin. Integrated analysis of various geophysical and geological datasets, such as bathymetry, heat flow measured directly by thermal probes and calculated from gas hydrate distribution limits, thermal conductivities, and piston cores, have improved the knowledge about the hydrogeological system. In addition, rock dredging has evidenced the volcanism associated with ridge subduction. Here, we argue that the localized high heat flow over the toe of the accretionary prism results from fluid advection promoted by pressure-driven discharge (i.e., dewatering/discharge caused by horizontal compression of accreted sediments) as reported previously. However, by computing the new heat flow values with legacy data in the study area, we raise the assumption that these anomalous heat flow values are also promoted by the eastern flank of the currently subducting Chile Rise. Part of the rift axis is located just below the toe of the wedge, where active deformation and vigorous fluid advection are most intense, enhanced by the proximity of the young volcanic chain. Our results provide valuable information to current and future studies related to hydrothermal circulation, seismicity, volcanism, gas hydrate stability, and fluid venting in this natural laboratory.


Coexistence of two types of Late Paleocene adakitic granitoids, Soursat complex, NW Iran


Early Cambrian highly fractionated granite, Central Iran: evidence for drifting of Northern Gondwana and the evolution of the Proto-Tethys Ocean


U-Pb dating of granitic cobble (dropstone) recovered from inner slope of the Chile Trench (48°S): Constraint for its provenance


Hf-O isotope systematics of zircons from the Taitao granitoids: Implications for slab-melting material


Sequential magma injection with a wide range of mixing and mingling in Late Jarassic plutons, southern Ghorveh, western Iran


Source of U and Th in a paleobeach groundwater aquifer at Coxs Bazar, southeast Bangladesh


Landscape and early farming at Neolithic sites in Slemani, Iraqi Kurdistan: A case study of Jarmo and Qalat Said Ahmadan.


Accretion and oxidation of a superfast-spread axial melt lens: TIMS and SIMS zircon analysis of the IODP Hole 1256D gabbros


U-Pb ages of Miocene near-trench granitic rocks of the Southwest Japan arc: implications for magmatism related to hot subduction


Hydrogeochemical and isotopic signatures for the identification of seawater intrusion in the paleobeach aquifer of Cox's Bazar city and its surrounding area, south-east Bangladesh.


Holocene fluvial and anthropogenic processes in the region of Uruk in southern Mesopotamia


Age and petrogenesis of Na-rich felsic rocks in western Iran: evidence for closure of the southern branch of the Neo-Tethys in the Late Cretaceous.


The Kuradawe granitic pegmatite from the Mawat ophiolite, Northern Iraq: Anatomy, mineralogy, geochemistry, and petrogenesis


Appendix 1: Stones used in the Qalat Said Ahmadan and their sources.


Excavations at Qalat Said Ahmadan, Slemani, Iraq-Kurdistan: First Interim Report (2014 Season).


The Taitao ophiolite-granite complex, Chile: Emplacement of ridge-trench intersection oceanic lithosphere on land and origin of calc-alkaline I-type granites


Magma flow directions in the sheeted dike complex at superfast spreading mid-ocean ridges: Insights from IODP Hole 1256D, eastern Pacific.


Environmental fluctuations in the northwestern Pacific Ocean during the last interglacial period: evidence from radiolarian assemblages.


Boron and other trace element composition of the Quaternary volcanic rocks from the Southern Volcanic Zone in Andean Arc: Implication for the slab-derived component.


Petrogenesis of the ridge subduction-related granitoids from the Taitao Peninsula, Chile Triple Junction area.


Geochronological fingerprint revealing the evolution of the crust underlying Cerro Pampa, Argentine Patagonia: Constraint from LA-ICPMS U-Pb ages for exotic zircons in the Mid-Miocene adakite.


Shallow-depth melt eduction due to ridge subduction: LA-ICPMS U-Pb igneous and detrital zircon ages from the Chile Triple Junction and the Taitao Peninsula, Chilean Patagonia


Fabric based criteria to distinguish tectonic from sedimentary mélanges in the Shimanto accretionary complex, Yakushima Island, SW Japan


Detailed observation of topography and geologic architecture of a submarine landslide scar in a toe of an accretionary prism

Submarine Mass Movements and Their Consequences Y. Yamada, K. Kawamura, K. Ikehara, Y. Ogawa, R. Urgeles, D. Mosher, J. Chaytor and M. Strasser (eds.), Advances in Natural and Technological Hazards Research


Glaciological Research Project in Patagonia 2006-2009 Studies at Glaciar Perito Moreno, Hielo Patagonico Sur, in area of Hielo Patagonico Norte, and along the Pacific Coast:Studies at Glaciar Perito Moreno, Hielo Patagónico Sur, in area of Hielo Patagónico Norte, and along the Pacific Coast

The Glaciological Research Project in Patagonia (GRPP) 2006-2009 was carried out with several objectives at Glaciar Perito Moreno of the Hielo Patagónico Sur (HPS), in the area of the Hielo Patagónico Norte (HPN) and along the Pacific coast. At Glaciar Perito Moreno, hot water drilling was carried out at about 5km upstream from the terminus, reaching the glacier bottom at ca. 515m, in order to monitor subglacial water pressure. Good positive correlations among air temperature, subglacial water pressure and glacier flow speed were found. Based on 14C dating of tree and organic samples, it is proposed that Glaciar Perito Moreno made two Little Ice Age (LIA) advances at AD1600-1700 and ca. 130-100y BP (AD1820-50). Fan deltas located at the mouth of big rivers around Lago General Carrera (Buenos Aires) and Lago Cochrane (Pueyrredon), in the area east of the HPN, were investigated to elucidate their development. The variations of 21 outlet glaciers of the HPN elucidated from aerial surveys for 2004/05-2008/09 revealed an areal loss of 8.67km2 in four years. A general slowing down of retreats was observed with a few exceptions. Meteorological measurements at Glaciar Exploradores of the HPN from 2005 to 2009 indicate that air temperature ranged from 17.4°C to -10.5°C. The total annual precipitation was about 3000mm. Glacier surface melt was observed at two spots. Sediment and water discharges from the glacier showed that while water discharge fluctuated a lot, suspended sediment concentration was rather stable in summer. A single channel seismic profiling during the JAMSTEC MR08-06 cruise identified a probable submerged moraine formed before the last glacial maximum (LGM) in the Golfo de Penas, south of Taitao Peninsula. Piston coring along the Chilean coast further indicates that ice-rafted debris recorded the LGM and earlier Late Pleistocene events of the glacial advance.


Rapid exhumation of subducted sediments along an out-of-sequence thrust due to seamount subduction followed by gravitational collapse in the active eastern Nankai accretionary prism

Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin Y. Ogawa, R. Anma and Y. Dilek (eds.), Modern Approaches in Solid Earth Sciences


Submarine outcrop evidence for transpressional deformation within the Nankai accretionary prism, Tenryu canyon, Japan


Structural profile and development of the accretionary complex in the Nankai trough, Southwest Japan: Results of submersible studies

YK99-09, YK00-08, YK05-08 and YK06-02 Shipboard Science Parties


Structure, texture, and physical properties of accretionary prism sediments and fluid flow near the splay fault zone in the Nankai Trough, off Kii Peninsula

潮岬海底谷に露出する南海トラフ分岐断層付近の付加体堆積物の構造・組織・物性と流体移動

Shionomisaki Canyon, off Kii Peninsula, SW Japan, cuts through five E–W-trending ridges developed in the Nankai accretionary prism. Using the submersible SHINKAI 6500, we investigated outcrops along the eastern canyon wall in the landward-most ridge. Four dives yielded information on lateral variations in the structure, texture, and physical properties of sediments along the splay fault zone in the accretionary prism. The ridge itself is disrupted by E–W-trending gullies that continue to bifurcations in the splay fault. Southward (seaward) dipping strata are predominant in gently folded, commonly steeply inclined sediments of gravity flow origin. The south-younging sequence is consistent with the radiolarian biostratigraphy. The sediments in this region are Pliocene to Recent in age (<4.3 Ma). Detailed observations reveal soft-sediment deformation structures such as web structure, vein structure, and deformation bands. The distribution of structures and chemosynthetic biocommunities (vesicomyid bivalves and tube worms) marks the position of faults that accompany active cold seepages. Porosity decreases southward toward the splay fault, showing a negative correlation with the age of the sedimentation (i.e., older sediments have higher porosity). This finding indicates progressive tectonic compaction toward the splay fault. The uniaxial compressive strength of sandstone, as calculated from a needle penetration test, shows a marked increase above the deduced fault zones. We attribute this finding to the precipitation of carbonate cement from CaCO3-saturated fluids that migrated along the splay fault and its bifurcations. Sandstones with high pore-connectivity and permeability, located above the faults, acted as a channel through which CaCO3-saturated fluids migrated. The related cementation acted to strengthen the frontal part of the ridge, which may act as an indenter for the inner wedge and as a backstop for the outer wedge. The proposed model accounts for the southward decrease in porosity behind the ridge front.

「しんかい6500」による潜航調査から南海トラフ分岐断層付近の構造・物性・組織プロファイルを得た．地層は4.3 Ma以降の堆積年代をもつ南傾斜・南側上位の重力流堆積物からなる．分岐断層は下位の付加体堆積物を上位の海溝斜面堆積盆堆積物へ衝上させる．南側へ小さくなる間隙率と泥質岩に発達する平面型組織は地層がテクトニックな側方圧縮と剪断を受けたことを示唆する．断層の上位で堆積物の一軸圧縮強度は顕著に大きくなる．方解石膠着物が大きな強度を担っている．断層上位の透水性のよい砂岩層は炭酸塩に飽和した流体移動の流路となって方解石が沈殿した．この過程は現位置に近い付加体内で生じた．膠着作用によって強度が増加したリッジ前縁部は，陸側のinner ridgeに対してはindenterとして，海側のouter ridgeに対してはbackstopとして作用し，リッジ前縁部の前後に対称的な変形様式をもたらしたであろう．


Spaceborne ASTER image analysis revealed compositional variation of the Viedma volcano in Andean Austral Volcanic Zone


Ophiolite emplacement and the effects of the subduction of the Chile Ridge System: Heterogeneous paleostress regimes recorded in the Taitao Ophiolite (Southern Chile)


The Genesis and Mixing/Mingling of Mafic and Felsic Magmas of a Back-Arc Granite Pluton: the Miocene Tsushima Pluton, Southwest Japan


Chemical and chronologic complexity in the convecting upper mantle: Evidence from the Taitao ophiolite, southern Chile


Structural architecture and active deformation of the Nankai accretionary Accretionary Prism, Japan: submersible survey results from the Tenryu Submarine Canyon

YK05-08 Leg 2 and YK06-02 Shipboard Scientific Parties


Are the Taitao granites formed due to subduction of the Chile ridge?


Progressive metamorphism of the Taitao ophiolite; Evidence for axial and off-axis hydrothermal alterations


Paleocurrent patterns of the sedimentary sequence of the Taitao ophiolite constrained by anisotropy of magnetic susceptibility and paleomagnetic analyses


Structural and fabric analyses of basal slip zone of the Jinnosuke-dani landslide, northern central Japan: its application to the slip mechanism of decollement


Drilling to gabbro in intact ocean crust.

Sampling an intact sequence of oceanic crust through lavas, dikes, and gabbros is necessary to advance the understanding of the formation and evolution of crust formed at mid-ocean ridges, but it has been an elusive goal of scientific ocean drilling for decades. Recent drilling in the eastern Pacific Ocean in Hole 1256D reached gabbro within seismic layer 2, 1157 meters into crust formed at a superfast spreading rate. The gabbros are the crystallized melt lenses that formed beneath a mid-ocean ridge. The depth at which gabbro was reached confirms predictions extrapolated from seismic experiments at modern mid-ocean ridges: Melt lenses occur at shallower depths at faster spreading rates. The gabbros intrude metamorphosed sheeted dikes and have compositions similar to the overlying lavas, precluding formation of the cumulate lower oceanic crust from melt lenses so far penetrated by Hole 1256D.


Geologic reconnaissance of Lautaro volcano, Chilean Patagonia


Zircon sensitive high mass-resolution ion microprobe U-Pb and fission-track ages for gabbros and sheeted dykes of the Taitao ophiolite, Southern Chile, and their tectonic implications


Overview of Glaciological Research Project in Patagonia 2003


Accretionary complex origin of the Mafic-Ultramafic bodies of the Sanbagawa belt, central Shikoku, Japan.


Tectonic rotations during the Chile ridge collision and obduction of the Taitao ophiolite (Southern Chile)


The Quaternary volcanic activity of Hudson and Lautaro volcanoes, Chilean Patagonia: new constraints from K-Ar ages


Ca depletion in the soil column on a granite substrate on the island of Yakushima, a world natural heritage site


Subhorizontal boundary between ultrahigh-pressure and low-pressure metamorphic units in the Sulu-Tjube area of the Kokchetav Massif, Kazakhstan


Kinematic analysis ultrahigh-pressure-high-pressure metamorphic rocks in the Chaglinka-Kulet area of the Kokchetav Massif, Kazakhstan


Geology of Kokchetav UHP-HP metamorphic belt, Northern Kazakhstan


Compositional zoning and its implication in a toroidal circulation inside the Yakushima pluton, SW Japan

"Origin and Evolution of the Continental Crust" Memoirs of National Insitute of Polar Reasearch, Special Issue


Experiments on pluton shapes and tracks above subduction zones

Granite: from segregation of melt to emplacement fabrics J. L. Bouchez, D. Hutton and W. E. Stephens (eds.)


Oblique diapirism of the Yakushima granite in the Ryukyu arc, Japan


肥沃な三日月地帯東部の新石器化-イラク·クルディスタン，スレマニ地域チャルモ遺跡の調査 (2022年)

第30回西アジア発掘調査報告会報告集

第30回西アジア発掘調査報告会報告集


肥沃な三日月地帯東部の新石器化-イラク·クルディスタン，スレマニ地域チャルモ遺跡の調査 (2021年)-

第29回西アジア発掘調査報告会報告集

第29回西アジア発掘調査報告会報告集


肥沃な三日月地帯東部の新石器化-イラク・クルディスタン，スレマニ地域チャルモ遺跡の調査(2019年・2020年)-

第28回西アジア発掘調査報告会報告集

第28回西アジア発掘調査報告会報告集


肥沃な三日月地帯東部の新石器化-イラク・クルディスタン，スレマニ地域チャルモ遺跡の調査(2019年)-

第27回西アジア発掘調査報告会報告集

第27回西アジア発掘調査報告会報告集


海洋地殻の冷却プロセスと海洋底磁気構造

海洋地殻の冷却プロセスと海洋底磁気構造

フィッション・トラック ニュースレター

フィッション・トラック ニュースレター


ジルコン結晶形とU-Pb年代

ジルコン結晶形とU-Pb年代

フィッション・トラック ニュースレター

フィッション・トラック ニュースレター


Detrital zircon Fission-Track analyses from accretionary complex in the Nankai Trough, Japan


鹿児島県，屋久島花崗岩体に見られるSr同位対比初生値の累帯構造

鹿児島県，屋久島花崗岩体に見られるSr同位対比初生値の累帯構造


海洋底熱年代学への展望:深海掘削孔およびオフィオライトのウラン含有鉱物・年代・地温勾配

フィッション・トラック ニュースレター

フィッション・トラック ニュースレター


タイタオ・オフィオライトから読みとる海嶺衝突によるオフィオライトの形成プロセス

タイタオ・オフィオライトから読みとる海嶺衝突によるオフィオライトの形成プロセス


伊豆-小笠原弧衝突境界付近に発達するクロム透輝石を含む岩脈の水濃度

伊豆-小笠原弧衝突境界付近に発達するクロム透輝石を含む岩脈の水濃度


Preliminary report on geology and morphology of the Patagonian volcanic field, South America: CHRISTMASSY-GRPP joint expedition

Annual Report, Institute of Geoscience, Univ. Tsukuba


潮岬海底谷沿いの付加体断面とシロウリ貝コロニーの産状:6K#522, 6K#579潜航報告


屋久島花崗岩体の貫入機構について

屋久島花崗岩体の貫入機構について


西南日本外帯，中期中新世花こう岩類のジルコンのREE組成とマグマ成因-スラブ溶融の可能性について-

月刊地球号外「花崗岩研究の最前線」

月刊地球号外「花崗岩研究の最前線」


Competence contrast between oelitic schist and silicified oelitic schist in the Twakuni-Yanai area of the Ryoke Belt, southwest Japan

岩国-柳井領家帯の泥質片岩と珪化岩に認められるコンピテンス較差

Pelitic metamorphic rocks of the Ryoke Belt are distributed in the Rokuroshi area, southern part of Iwakuni district. Dark-brown biotite schist was locally silicified and decolorized to form milky-white "silicified domain". Quartz veins were developed in both of the biotite schist and silicified domain. The veins in biotite schist are generally parallel to the schistosity and form boudinage due to ductile now of the host rock. The veins in silicified domain are oblique to the schistosity with medium to high angles and have not undergone ductile deformation except for some schistosity-parallel veins. The mode of occurrence of these veins indicates that the silicified domain is much more competent than the biotite schist. Ductile deformation after the silicification was accommodated by viscous now of biotite schist. The silicification probably results from dissolution-precipitation processes which may have raised pore pressure to cause hydraulic fracturing.