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1.
基于雷达干涉测量技术,利用ALOS-2、Sentinel-1卫星升降轨雷达影像,获得2019-10~12发生在菲律宾棉兰老岛的4次MW>6.0地震的同震形变场,并以此形变结果为约束,反演得到4次地震的断层运动模型。综合分析发现,此次地震序列由3条断裂的破裂引起,其中2019-10-16和2019-10-31的2次地震为同一发震断裂,2019-10-31地震断层破裂区域位于2019-10-16地震断层破裂的东北延伸段,最大滑动量约为1.1 m,约为2019-10-16地震最大滑动量的2倍。2019-10-29地震由一条独立断层破裂引起,断层最大滑动量约为2.0 m。2019-12-15地震由一条东北向倾斜断层破裂引起,断层最大滑动量约为3.0 m。此外,2019-10-16地震引起2019-10-29地震显著滑动区明显的正向库仑应力传输;而2019-10-29地震显著增加了2019-10-31地震震源区域的库仑应力;前3次地震对2019-12-15地震孕震断层的库仑应力传输总和为负值,说明静态库仑应力传输可能不是此次地震触发的主要诱因。 相似文献
2.
在水温26.8~31.8℃、PH值7.8~8.1室内条件下,于12.8~37.1盐度范围设置10个梯度,观察不同海水盐度对施獭蛤(Lutraria sieboldii)稚贝存活及生长的影响。结果表明:施獭蛤稚贝适宜生存盐度为19.8~33.8,最适宜生存盐度为26.3~31.7;适宜生长盐度为21.9~33.7,最适宜生长盐度为26.3~29.0。 相似文献
3.
The structural feature of agar polysaccharides from Porphyra haitanensis grown in south China and transplanted to the north was investigated by fractioriation on DEAE - Sephadex A 50, chemical analysis, and infrared and 13C - NMR spectroscopy.The agars composed mainly of Charged molecules were eluted from DEAE - Sephadex A 50 with 1.0 mol/L- NaCl solution from the southern P. haitanensis and with 0.5 mol/L NaCl from the northern one. The 13C-NMR spectra showed that agarobiose [(1 -3)- B D - galactopyranosyl - (1 -4)-3,6-anhydro-a-L-galactopyranose] and the biological precursor of agarobiose [(1-3} B-D-galactopyra nosyl- (1-4)- 6- sulfate-a- L-galactopyranose ] were the major disaccharide repeating units in the charged fractions. The content of the biological precur sor in the agar polysaccharides from southern P. haitanensis was higher than that in the northern one, the content of the biological precursor extracted from cold water was higher than that from hot water, and the content of 6- OMe-D-galactos 相似文献
4.
Zircon LA-ICP-MS U-Pb age, geochemical and Nd isotopic data are presented for a newly recognized high-Mg dioritic dike from Haicheng, Liaodong Peninsula, NE China, to constrain its petrogenesis. The zircons from the high-Mg diorite exhibit striped absorption and oscillatory growth zoning in the cathodoluminescence （CL） images, and have high Th/U ratios （0. 05-0.9）, indicating a magma origin. Zircon LA-ICP-MS U-Pb dating indicates that 206pb/238U ages of 12 spots of zircons are between 167 Ma and 178 Ma, yielding a weighted mean 206pb/238U age of 172 ＋ 2 Ma （MSWD =4. 1 ）, which represents the forming age of the high-Mg dioritic dike, i. e. Middle Jurassic. Geochemically, the samples have SiO2 =55.4-60. 6 wt. % , Na20 =2. 2-2.76 wt. % , K20 = 1.32-2. 02 wt. % and （Na2O ＋ K2O） =3.82--4. 47 wt. %, belonging to sub-alkaline series and displaying a calc-alkaline evolutionary trend. They are characterized by high MgO （4. 75-6.85 wt. % ）, Mg# （55-61）, Cr（130-262 ppm）, Ni（63-130 ppm）, Sr（568-857 ppm）, and Ba（484-1 130 ppm） contents, with geochemical features analogous to those of high-Mg adakites. They show variable end （t） values （ - 1.3 to - 3.9） , with a weighted value of - 2. 7, which plot intermediately between the field of the ancient continental crust and the depleted mantle source, indicating that both the lower crust and mantle source are necessary for the generation of the parent magma of the Haicheng high-Mg diorites. The Haicheng high-Mg dioritic dike in the Liaodong Peninsula and the Jurassic magmatism in the eastern North China Craton formed under a continental crustal thickening setting that may be related to subduction of the Paleo-Pacific oceanic plate. 相似文献
5.
Wei Min 《世界地质(英文版)》2001,4(1)
The gold - silver complex ore field of Qingchengzi is located in Liaohe group of Liaodong rift. The gold - silver ore bodies mainly lie in Dashiqiao group and Gaixian group, which provides ore - forming materials for the mineralization. For taking place multi - period and multi - stage magmatic activities, the ore - forming materials in the formation had had dynamothermal metamorphism for a long time and enriched and formed ore bodies after magmatism in Indo- Chinese and Yanshan epoch. The ore bodies are controlled by stratigraphic formation and stored in the interformational faults and schistosity belts. Silicalite is the most important indicator for searching them. Although the Pb - Zn and the gold - silver deposits are the same series of mineralized products, their positions are different, resulting from the differences of elements nature and mineralized conditions. The gold silver deposits belong to strata - bound and hysterogenetic mesothermal - epithermal deposit. 相似文献
6.
Dawsonite, NaAlCO3(OH)2, is widespread as a cement, replacement and cavity filling in Hailaer Basin in China and Bowen-Gunnedah-Sydney (BGS) basin system in Australia. The origin of dawsonite is emphatically contrasted and analyzed through stable isotopic composition. Dawsonite δ13C values ranging from -4.0×10-3 to 4.1×10-3 are remarkably consistent through the BGS basin system. The calculated δ13C values of CO2 gas in isotopic equilibrium with dawsonite range from -11.3×10-3 to -4.6×10-3. These values indicate carbon of dawsonite came from inorganic CO2 gas accompanied by magmatic activity. In Hailaer Basin, the Dawsonite δ13C values ranging from -4.64×10-3 to 2.12×10-3 are also consistent. The calculated δ13C values of CO2 gas in isotopic equilibrium with dawsonite range from -11.82×10-3 to -5.11×10-3. According to the coincidence of dawsonite-bearing well and CO2 gas well with mantle source,lying along deep fracture within or adjacent to Yanshanian granite,it is concluded that CO2 gas forming dawsonite is derived from mantle related to magmatic process during the Yanshanian. A little biologic origin carbon owing to petroleum charging intervened when dawsonite formed. 相似文献
7.
BD-2星载原子钟长期在轨性能评估 总被引：1，自引：0，他引：1
利用WHU和GFZ提供的2013-01-01~2018-05-01北斗精密钟差数据，从原子钟相位、频漂、频率准确度和频率稳定度指标等方面对BD-2星载原子钟的长期在轨性能进行评估。结果表明，相位数据连续性和稳定性不佳，调相操作频繁；频漂维持在10-18~10-17 /s量级；准确度处于10-11量级，比较稳定；万秒稳定度在10-14~10-13量级，MEO卫星相较于GEO和IGSO卫星更加稳定。此外，分析原子钟切钟对频漂、准确度和稳定度的影响，并给出BD-2卫星钟的切换信息。 相似文献
8.
Toshitaka Suzuki Yoshinori Iizuka Teruo Furukawa Kenichi Matsuoka Kokichi Kamiyama Okitsugu Watanabe 《极地研究(英文版)》2003,14(1)
1 IntroductionAntarcticicesheetisaburialgroundforatmosphericdeposition .Sincethereiscon tinuousinteractionbetweentheicesheetandtheatmosphere,variousatmosphericsub stancesareinjectedtotheicesheetsequentiallyintimeandspace.Therefore,verticalanalysesoftheicesheetprovideuswithinformationaboutpastclimaticchange (Delmas1 992 ;LegrandandMayewski 1 997)andhorizontalanalysesoftheicesheetprovideuswithknowledgeregardinglong rangetransportofairbornematerials (Kamiyamaetal.1 989;KreutzandMayewski 1 999)… 相似文献
9.
利用德克萨斯大学空间研究中心（CSR）发布的GRACE时变重力场模型,基于最大信噪比准则确定RL06球谐系数模型（spherical harmonics,SH）的最优高斯滤波半径,在此基础上反演2002-04~2020-05刚果河流域陆地水储量变化,结合水文与降雨、蒸散资料分析其驱动因素。研究结果表明,GRACE模型估计的刚果河流域水储量变化和水文模型估计的地表水储量变化的周年振幅一致,表明刚果河流域的陆地水储量周年变化驱动因素为地表水。对于年际变化,2002-04~2020-05陆地水储量变化呈轻微增加趋势,2002-04~2006-12明显减少,RL06 SH模型估计结果为-2.30±0.24 cm/a;2007-01~2010-12呈现增加趋势,为0.38±0.24 cm/a;2011-01~2020-05水储量增速变大,为0.92±0.12 cm/a,该结果与CSR Mascon估计结果一致。 相似文献
10.
山东省还没有发现过独立的铂族元素矿床，但在济南历城铜镍矿床中存在可回收的伴生铂族元素。在众多的中生代金矿床中铂族元素常常出现，虽然还没有经济意义，但可作为寻找新的铂族元素矿床的线索。根据近年来国内外铂族元素地质找矿与成矿理论研究的新进展，在山东寻找铂族元素矿床是值得注意的。山东可能存在多个时代(太古宙、元古宙和中生代)的成矿作用，矿床类型也可能是多种多样的，如与基性一超基性岩有关的济南历城式铜硫镍化物型矿床、与金伯利岩筒有关的铂族元素矿床和热液成因多元素组合的铂族元素矿床等。 相似文献
11.
Carbonates and clastic rocks are well developed in the second - order basins of an Paleoproterozoic aulacogen in the northern Kuandian area, Liaoning Province. The carbonates consist of two parts, the upper and the lower carbonate formations. The clastic rocks occured between the two formations. Two Pb- Zn ore belts exist in both of upper and lower carbonate formations and are called B and A - belt respectively. Several tens of Pb - Zn ore bodies are found in A - belt. Some Pb - Zn ore bodies are apparent in vertical zoning in a sequence of Fe - Zn - Pb - Ba from the lower to the upper. Geological and geochemical researches show that the ore components in the A- belt was exhalated from the liquid source bed deeply and was precipitated in a closed second - order basins. While those in the B - belt was derived from the upper crust and was deposited in a normal oceanic enviornment. The second - order basins in Liaodong - Ji' nan - North Korean Peninsular aulacogen at the margin of the Archean craton are promising sites for looking for the deposits formed by exhalation of the liquid source bed deeply under crust. 相似文献
12.
MIL090036 is a previously unknown meteorite （a feldspathic lunar breccia） that was discovered in Antarctica. The detailed petrography and mineralogy of this meteorite forms the subject of this paper. It has a typical clastic texture that consists of various types of rock debris （e.g. anorthosite, gabbroic anorthosite, gabbro, regolith breccia, troctolite, microporphyritic crystalline impact melt and compound clasts）, mineral crystal fragments （e.g. pyroxenes, plagioclase, olivine and ilmenite） and feldspathic glass clasts. The ifne-grained recrystallized minerals and mineral clasts are cemented together in a glassy groundmass. The anorthite content of plagioclase in the gabbro （An81-83） and anorthosite （An88-93） both have relatively low calcium content compared to those from other breccias （An90-98）. The pyroxene composition （Fs12-35 Wo3-44 En22-79） in the rock debris, crystal mineral clasts and anorthositic glass clasts are relatively iron-deifcient compared to those from gabbro debris with melt glass （Fs37-65 Wo10-29 En21-49） and groundmass （Fs18-69 Wo3-45 En14-50）. In contrast, the pyroxene grains in the gabbroic anorthosite display a narrow compositional range （Fs24-27 Wo7-14 En59-69）. Olivine grains in mineral fragments and the groundmass have a wider compositional range （Fo57-79） than those in the rock debris （Fo67-77）. The Fe/Mn ratio in olivine is in the range of 47 to 83 （average 76） and 76 to 112 （average 73） in pyroxenes, and hence classify within the lunar ifeld. The characteristics of texture, mineral assemblage and compositions suggest that MIL090036 possibly originated from a region beyond that of the Apollo and Luna samples. Further study of MIL090036 is therefore likely to lead to a better understanding of the geological processes on the Moon and the chemical composition of the lunar crust. 相似文献
13.
Bacteria-infected turbots Scophthalmus maximus with septicaemia were examined between 2001 and 2004 in aspects of the conditions of disease occurrence, clinical syndromes and pathological changes. The phenotypic information of pathogenic bacteria was studied, including morphology, physiological and biochemical characteristics, and the mol% G C of the DNA. In addition, representative strains (S010623-1, LH031120-1) were selected for molecular identification by partial 16S rRNA gene sequencing. The results show that the isolates (LH031120-1 to LH031120-6, HT040308-1 to HT040308-6, HT040620-1 to HT040620-6) from three farms were identified as Edwardsiella tarda. The isolates (S010610-1 to S010610-10, S010623-1 to S010623-20) from one farm were identified as Listonella anguillarum. We conducted studies on the pathogenicity of isolates by artificial infection, and revealed all infected groups in morbidity and mortality. The septicaemia infected turbot showed a syndrome similar to that of the naturally infected fish. Antibiotic sensitivity showed that of 37 antimicrobial agents, E. tarda was sensitive to 27 agents, and L. anguillarum was sensitive to 21 agents. 相似文献
14.
浙江是环太平洋带最著名的非金属成矿区之一。本文在回顾浙江非金属矿床研究的基础上,论述了当前非金属成矿学、矿床地球化学、矿物学等领域中一些值得关注的问题或课题。 相似文献
15.
描记采于贵州省荔波县茂兰自然保护区范围内一地下河中的金线属一新种 ,以采集地县名命名荔波金线Sinocyclocheilusliboensis.sp .nov。新种外形与广西凌云金线相似 ,但前者鳃耙少 ,仅 4— 5 ,后者 9— 10 ;前者眼间距较窄 ,头长为眼间距的 3.4～ 3.6倍 ,后者 2 .4～ 3.0 (2 .8)倍 ;前者尾柄较细 ,尾柄长为尾柄高的 1.8倍 ,后者 1.3～ 1.6 (1.4 6 )倍 ;前者侧线鳞与体鳞一致 ,侧线上下鳞分别为 2 8— 30和 16— 18,后者侧线鳞大于体鳞 ,侧线上下鳞为 14— 17和 8— 11。 相似文献
16.
Vertical distribution of soil nematode communities under conventional tillage (CT),no-tillage (NT) and fallow field (FF) treatments in the Lower Reaches of the Liaohe River was investigated at six soil depths (0-5 cm,5-15 cm,15-30 cm,30-50 cm,50-75 cm and 75-100 cm). The results show that total nematode abundance gradually decreases with depth,and the highest number of total nematodes is observed at 0-5 cm depth under NT and FF treatments. The number of fungivores and plant parasites is significantly higher... 相似文献
17.
汪奇生 《大地测量与地球动力学》2022,42(8):840-845
提出一种差分码偏差估计的简化模型,将测站方向上各穿刺点的VTEC简化为一个参数,分时段进行直接估计。为验证该方法的有效性,采用球谐函数建模和基于GIM的估计方法进行比较分析。选用2016-01近200个IGS测站的GPS+GLONASS数据进行实验,并采用CODE提供的产品进行验证。结果表明,对于GPS(GLONASS)卫星DCB,该方法与其他2种方法估计的结果比较接近,与CODE产品相比平均偏差和标准差分别为-0.3～0.5 ns(GPS)、1.3～0.7 ns(GLONASS)和0.05~0.20 ns(GPS)、0.14~1.10 ns(GLONASS);对于接收机DCB,3种方法与CODE产品的平均偏差分别为-0.6～0.7 ns(GPS)和-1.5～1.5 ns(GLONASS)。实验结果验证了差分码偏差估计简化模型的有效性。 相似文献
18.
The petrogenesis and geodynamic setting of the Late Jurassic Baita porphyry quartz monzodiorite in Xingcheng--Liaoxi area provide information for understanding the Mesozoic tectonic evolution of the northeastern North China Craton. In this paper, geochronological, whole-rock geochemical, and in-situ zircon Hf isotopic analyses of Baita porphyry quartz monzodiorite were investigated to constrain the crystallization age and petrogenesis. Zircons exhibit typical oscillatory zoning in cathodoluminescence images and show relatively high Th/U ratios(0.78--1.62), and U-Pb analyses indicate that these rocks were crystallized during the Late Jurassic(159±1 Ma). Geochemically, they are characterized by high contents of SiO_2(65.21 wt%--65.31 wt%), Al_2O_3(16.29 wt%--16.31 wt%), Sr(521×10~(-6)-539×10~(-6)), and Sr/Y ratio(45.1--47.8) but low Y(10.9×10~(-6)-12.0×10~(-6)), with obvious adakitic geochemical affinities. These above-mentioned findings, combined with their negative ε_(Hf)(t) values(-21.7 to-20.2), corresponding two-stage model age(T_(DM2)) of 2 579--2 484 Ma, as well as low MgO(1.38 wt%--1.39 wt%), Cr(18.5×10~(-6)-19.5×10~(-6)) and Ni(9.45×10~(-6)-9.46×10~(-6)) values, indicate that Baita porphyry quartz monzodiorite may be generated by partial melting of the Neoarchean-Paleoproterozoic thickened basaltic lower crust. Based on the results from this study and pre-vious regional studies, it is concluded that Baita porphyry quartz monzodiorite was spatially related to the westward subduction of the Paleo-Pacific plate. 相似文献
19.
????1999??2007??2009??2011???GPS???????????????????1999??2007????????????????????????????????????????С?????????С????????????2009??2011???????????????????????????????????????????????????????????????????????? 1999??2007?????????????60??10 -9/a??λ??????????山?????????-????????-???????????????????????2009??2011??????????????????????????????????????????????????????????С?????????Χ????????????60??10 -9/a??????????1999??2007???????????????????????????????????????????????????????????????????????2009??2011?????????η????????????????????????????????????20??10 -9 rad/a??С??4??10 -9 rad/a?????????????????????4??10 -9 rad/a????25??10 -9 rad/a?????????????????????????????????????40??10 -9 rad/a????Щ???????????????????α??????? 相似文献
20.
基于2016年以来雷州半岛-海南岛陆地区（以下简称雷琼地区）的流动重力资料,对2017年下半年前后的联测资料采用不同的平差方法进行处理。将湛江和琼中2个绝对重力点作为雷琼测网基准,研究2016年以来雷琼地区重力场动态变化特征。重点研究2018-03-20广东阳江4.2级地震、2019-03-05广东雷州4.1级地震、2019-08-20海南三亚4.2级地震和2019-10-12广西北流5.2级地震震前区域重力场差分和累积动态变化。研究结果表明,除广东雷州4.1级地震外,其他3个地震震前在震中附近地区均存在重力场变化异常,表明在测网网格距和数据处理方法合理的情况下,对于4~5级地震,区域重力场在震前可能存在一定异常反应。 相似文献