排序方式: 共有64条查询结果,搜索用时 375 毫秒
41.
L. Golub E. DeLuca G. Austin J. Bookbinder D. Caldwell P. Cheimets J. Cirtain M. Cosmo P. Reid A. Sette M. Weber T. Sakao R. Kano K. Shibasaki H. Hara S. Tsuneta K. Kumagai T. Tamura M. Shimojo J. McCracken J. Carpenter H. Haight R. Siler E. Wright J. Tucker H. Rutledge M. Barbera G. Peres S. Varisco 《Solar physics》2007,243(1):63-86
The X-ray Telescope (XRT) of the Hinode mission provides an unprecedented combination of spatial and temporal resolution in solar coronal studies. The high sensitivity
and broad dynamic range of XRT, coupled with the spacecraft’s onboard memory capacity and the planned downlink capability
will permit a broad range of coronal studies over an extended period of time, for targets ranging from quiet Sun to X-flares.
This paper discusses in detail the design, calibration, and measured performance of the XRT instrument up to the focal plane.
The CCD camera and data handling are discussed separately in a companion paper. 相似文献
42.
Keiichi Tadokoro Kin'Ya Nishigami Masataka Ando Naoshi Hirata Takashi Iidaka Yukihiro Hashida Kunihiko Shimazaki Shiro Ohmi Yasuyuki Kano Makoto Koizumi Shigemitsu Matsuo Hiroo Wada 《Island Arc》2001,10(3-4):235-243
Abstract A water injection experiment was carried out by the scientific drilling program named the 'Nojima Fault Zone Probe' during the two periods 9–13 February and 16–25 March 1997. The pumping pressure at the surface was approximately 4 MPa. The total amount of injected water was 258 m3 . The injection was made between depths of 1480 m and 1670 m in the Disaster Prevention Research Institute, Kyoto University (DPRI) 1800 m borehole drilled into the Nojima Fault zone. A seismic observation network was deployed to monitor seismic activity related to the water injections. Seismicity suddenly increased in the region not far from the injection hole 4 or 5 days after the beginning of each water injection. These earthquakes were likely to be induced by the water injections. Most of the earthquakes had magnitudes ranging from −2 to +1. Numerous earthquakes occurred during the first injection, but only one could be reliably located and it was approximately 2 km north of the injection site. Between the two injection periods, earthquakes concentrated in the region approximately 1 km northwest of the injection site. During and after the second injection experiment, earthquakes were located approximately 1.5 km west of the injection site. Those earthquakes were located approximately 3 km or 4 km from the injection point and between 2 km and 4 km in depth. Values of intrinsic permeability of 10−14 –10−15 m2 were estimated from the time lapse of the induced seismic activity. The coefficient of friction in the area where the induced earthquakes occurred was estimated to be less than 0.3. 相似文献
43.
焉耆盆地是一个位于天山东南部的山间盆地 ,在遥感图像上 ,可以看到盆地西面的活动构造在地表留下的痕迹 :清楚的线形构造 ,被错开的水系、冲沟等。经分析认为 ,这些活动构造主要由北边的活动褶皱和南边的右行走滑活动断裂组成。野外的实际调查与图像分析的结果十分吻合 ,表明遥感图像在研究活动构造方面是一个十分有力和快速的工具。活动断层的最大水平位移为 2 10m ,最大垂直位移为 2 0m ,主要以走滑作用为主。天山地区活动构造的发育表明印度板块向欧亚板块的碰撞仍在持续 相似文献
44.
At Shiotani, SW Japan, rhyolitic welded tuff forms a steep-sided funnel-shaped body, confined by Paleogene granitic rocks
to an elliptical area 1–1.5 km across. The Shiotani welded tuff is pervasively welded and foliated concordantly with the contact
that dips inward at angles of 70–90°. In contrast, nearby contemporary volcaniclastic deposits are non-welded and gently inclined.
Near the contact with the granite, the tuff is plastically deformed and shows lineations that plunge inward at angles of 40–65°.
Lithic and crystal clasts in the rheomorphic outer part are rotated in a plane normal to the foliations and parallel to the
lineations indicating downward flow of the welded tuff. The geometry and internal structures suggest that the Shiotani welded
tuff was emplaced and welded in a funnel-shaped eruption conduit. Upon collapse of a plinian or phreatoplinian eruption column,
the majority of the conduit-filling pyroclasts probably fell back en masse into the conduit. Heat and steam from underlying
magma and diffusion of interstitial volatiles into the glass perhaps reduced the viscosity of juvenile pyroclasts and facilitated
welding in the conduit, especially at deep levels. The hot welded pyroclasts then flowed down the conduit wall during welding
compaction and retreat of the magma. These processes resulted in increased welding toward the contacts and welding foliations
concordant with the steep wall. Emplacement of nearby correlative volcaniclastic mass-flow deposits in a shelf to upper bathyal
environment suggests a possibility that, when active, the Shiotani conduit was under the sea. Welding compaction would occur
even under the sea provided that the steam generated in the upper part of the conduit fill prevented water access.
Received: 28 February 1996 / Accepted: 5 May 1997 相似文献
45.
Dr. T. Kano 《Mineralogy and Petrology》1991,45(1):29-45
Summary The augen gneisses exposed in the Katakai area, in the north-eastern part of the Hida metamorphic complex, central Japan, are highly metasomatized sheared rocks. They contain K-feldspar megacrysts of nearly maximum ordering, and occur in a narrow zone, 2–3 km wide and 20–25 km long, along the boundary between hornblende gneiss and early Mesozoic granites. The hornblende gneiss, the protolith of augen gneisses, is mylonitized toward the granite, accompanied by significant metasomatism under greenschist facies conditions. The enrichment of SiO2 and K2O, and the increase of modal quartz, K-feldspar and hydrous minerals, are well described in terms of the Ml-value [Mylonitization Index: the modal fraction of fine-grained matrix (< 0.2 mm) representing the amount of grain-size reduction in thin section]. The primary plagioclase was albitized and the essential mineral assemblages were changed from oligoclase + hornblende in the protolith to actinolite + chlorite + epidote, and then, into epidote + biotite, along with the increase in MI-value. The mineralogical changes and growth of low microcline were carried out by reaction with and precipitation from fluids which flowed from the granite into the country rocks under shearing.
Metasomatische Entstehung von Augengneisen und Myloniten im Metamorphen Komplex von Hida, Zentral-Japan
Zusammenfassung Die im Katakai-Gebiet im Nordostteil des metamorphen Komplexes von Hida, ZentralJapan, auftretenden Augengneise sind intensiv metasomatisierte, zerscherte Gesteine. Sie enthalten Megacryste von nahezu maximalem Ordnungszustand, und kommen in einer engen, 2–3 km breiten und 20–25 km langen Zone längs der Grenze zwischen Hornblendegneisen und frühmesozoischen Graniten vor. Der Homblendegneis, als Ausgangsgestein der Augengneise, ist gegen den Granit zunehmend mylonitisiert. Dies wird von signifikanter Metasomatose unter Grünschieferbedingungen begleitet. Die Anreicherng von SiO2 und K2O und die Zunahme von modalem Quarz, K-Feldspat und OH-führenden Mineralen sind im Rahmen des MI-Wertes (Mylonitisations-Index) beschrieben. Dieser Index gibt den modalen Anteil feinkörniger Matrix (< 0.2 mm) an und stellt den Betrag der Korngrößen-Reduktion in den Schliffen dar. Der primäre Plagioklas ist albitisiert, und die wichtigsten Mineralassoziationen wurden von Oligoklas + Hornblende im Ursprungsgestein in Aktinolit + Chlorit + Epidot, und dann in Epidot + Biotit umgewandelt; dies ging mit einer Zunahme des MI-Wertes einher. Die mineralogischen Umwandlungen, und das Wachstum von Tief-Mikroklin fanden durch Reaktion mit, und Ausfällung von Fluiden statt, die während der ScherVorgänge von Granit in die Nebengesteine migrierten.相似文献
46.
Carbon isotope stratigraphy of the Late Jurassic and earliest Cretaceous was revealed from Torinosu‐type limestone, which was deposited in a shallow‐marine setting in the western Paleo‐Pacific, in Japan. Two sections were examined; the Nakanosawa section of the late Kimmeridgian to early Tithonian age (Fukushima Prefecture, Northeast Japan), and the Furuichi section of the late Kimmeridgian to early Berriasian age (Ehime Prefecture, Southwest Japan). The age‐model was established using Sr isotope ratio and fossil occurrence. The limestone samples have a low Mn/Sr ratio (mostly <0.5) and lack a distinct correlation between δ13C and δ18O, indicating a low degree of diagenetic alteration. Our composite δ13C profile from the two limestone sections shows three stratigraphic correlation points that can be correlated with the profiles of relevant ages from the Alpine Tethyan region: a large‐amplitude fluctuation (the lower upper Kimmeridgian, ~152 Ma), a positive anomaly (above the Kimmeridgian/Tithonian boundary, ~150 Ma), and a negative anomaly (the upper lower Tithonian, ~148 Ma). In addition, we found that δ13C values of the Torinosu‐type limestone are ~1‰ lower than the Tethyan values in the late Kimmeridgian. This inter‐regional difference in δ13C values is likely to have resulted from a higher productivity and/or an organic burial in the Tethyan region. The difference gradually reduces and disappears in the late Tithonian, where the Tethyan and our δ13C records show similar stable values of 1.5–2.0‰. This isotopic homogenization is probably due to changes in the continental distribution and the global ocean circulation, which propagated the 13C‐depleted signature from the larger Paleo‐Pacific to the smaller Tethys Ocean during this time. 相似文献
47.
A numerical simulation was conducted to predict the change of pCO2 in the ocean caused by CO2 leaked from an underground aquifer, in which CO2 is purposefully stored. The target space of the present model was the ocean above the seafloor. The behavior of CO2 bubbles, their dissolution, and the advection-diffusion of dissolved CO2 were numerically simulated. Here, two cases for the leakage rate were studied: an extreme case, 94,600 t/y, which assumed that a large fault accidentally connects the CO2 reservoir and the seafloor; and a reasonable case, 3800 t/y, based on the seepage rate of an existing EOR site. In the extreme case, the calculated increase in ΔpCO2 experienced by floating organisms was less than 300 ppm, while that for immobile organisms directly over the fault surface periodically exceeded 1000 ppm, if momentarily. In the reasonable case, the calculated ΔpCO2 and pH were within the range of natural fluctuation. 相似文献
48.
Chemostratigraphy of the Ediacaran basinal setting on the Yangtze platform,South China: Oceanographic and diagenetic aspects of the carbon isotopic depth gradient
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Seishiro Furuyama Akihiro Kano Yoko Kunimitsu Tsuyoshi Ishikawa Wei Wang Xin‐chun Liu 《Island Arc》2017,26(5)
The Ediacaran Yangtze platform in South China, which represents depositional settings ranging from coastal to basinal, provides valuable information for understanding climate changes and animal evolution during the Ediacaran Period. Although the shallower settings have been investigated, research on the basinal sections has been limited. This has hampered efforts to establish stratigraphic correlations and understand the oceanographic setting of the Yangtze platform. In this paper, the chemostratigraphy of a basinal section at Fengtan, Hunan Province, is reported based on analyses of stable carbon isotope profiles in carbonates (δ13Ccarb), organic matter (δ13Corg), total organic carbon, 87Sr/86Sr ratios, and Mn, Rb, and Sr concentrations. The basinal section of the Doushantuo Formation, which is represented at Fengtan, provides data supporting regional correlations and oceanography. Three intervals in the Doushantuo Formation are correlated with the Three Gorges: (i) a negative δ13Ccarb anomaly with stable δ13Corg values and altered 87Sr/86Sr ratios in the lower section can be correlated to the boundary between Doushantuo Members 2 and 3 (Interval A); (ii) a relatively high δ13Ccarb anomaly with unaltered 87Sr/86Sr ratios (up to 0.7086) in the middle section corresponding to the lower part of Doushantuo Member 3 (Interval B); and (iii) a negative δ13Ccarb anomaly with lowered δ values in the upper section can be correlated to the long interval of negative δ13Ccarb (Interval C). The Gaskiers glaciation is likely represented in Interval A, and Interval C corresponds to the Shuram excursion reported for other Ediacaran localities. Our correlations confirm the depth gradient of δ13Ccarb in the Yangtze platform and imply that reductive conditions prevailed in the basinal section from the Early to Middle Ediacaran. Under such conditions, anaerobic degradation of organic carbon or methane perturbed the inorganic carbon isotopic compositions and was at least partly responsible for the depth gradient of δ13Ccarb. 相似文献
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