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Over the past decade, Indigenous peoples in Taiwan have shown a strong desire for the ??return of the Native??; this includes the Truku people in eastern Taiwan. Seizing a favorable climate of political opportunity structure in 2004, the Truku people first succeeded in obtaining the Taiwanese government??s recognition as an independent Indigenous nation??formerly considered a subgroup of the Atayal Nation. Then, riding on accumulated political resources, a few Truku elites started to engage in a government-initiated tribal mapping project. However, while tribal mapping originated in some North American Indigenous communities with a bottom-up process and spirit, the Taiwanese government sent both money (through the municipal government) and an academic expert team into the community to initiate and to assist (the elite group) with the tribal mapping project. These top-down government initiatives resulted in at least two major ill effects. First of all, two other subgroups of the Atayal Nation living in the same region were systematically excluded from the tribal mapping project, to the extent that their own traditional territories became part of the traditional territory of the newly formed Truku Nation. Secondly, possibly expecting a high political payoff on the part of elites, elite competition arose during the process of tribal mapping, with the interests of other community members largely ignored. As such, instead of establishing a decolonizing force, the ??return of the Truku?? appears to have achieved ??colonialism from within.?? This paper analyzes this process and considers ways to develop a more democratic strategy for the ??return of the Truku.?? 相似文献
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Natural Hazards - The Ocoña River Valley, in the Arequipa Department in southern Peru, extends over 150 km from the Pacific coast to its headwaters in the Andes Mountains. While... 相似文献
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《地质学报》1932,11(2):101-105
In opening the meeting, the chairman made the following address: "It is my agreable duty to announce and make the award of the Grabau Medal to two members of our Society, Drs. J. S. Lee and Davidson Black. "The Grabau Medal was founded in 1925 by Mr. C. Y. Wang. the then President of the Geological Society. It was so named in honor of Dr. Grabau 相似文献
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The Kemalpa?a Basin is one of the Quaternary basins in Western Anatolia and represents the south-western branch of the Gediz Graben system in this extensional province. This basin has been formed under the NNE–SSW trending extensional tectonic regime. It is bounded by a major fault, the Kemalpa?a Fault, in the south and it is bounded by a number of downstepping faults, called as Spilda?? Fault Zone, in the north. Both margin-bounding faults of the Kemalpa?a Basin are oblique-slip normal faults. In order to better understand the activities of these faults, we investigated the tectonic geomorphology of the Kemalpa?a Basin and interpreted the effect of tectonic activity on the geomorphological evolution using geomorphic markers such as drainage basin patterns, facet geometries and morphometric indices such as hypsometric curves and integral (HI), basin shape index (Bs), valley floor width-to-height ratio (Vf) and mountain front sinuosity (Smf). The morphometric analysis of 30 drainage basins in total and mountain fronts bounding the basin from both sides suggests a relatively high degree of tectonic activity. The mountain front sinuosity (Smf) generally varies from 1.1 to 1.3 in both sides of the basin suggesting the active fronts and facet slopes (12°–32°) suggest a relatively high degree of activity along the both sides of the Kemalpa?a Basin. Similarly, the valley floor width-to-height ratios (Vf) obtained from the both sides indicate low values varying from 0.043 to 0.92, which are typical values (<1) for tectonically active mountain fronts. The all values obtained are lower for the southern side. Therefore, we suggest that the tectonic activity of the Kemalpa?a Fault higher than the Spilda?? Fault Zone. This difference that can be arised from the different uplift rates also reveals the typical asymmetric characteristics of the Kemalpa?a Basin. Additionally, the trapezoidal facets which have been observed on the southern side of the basin indicate that the Kemalpa?a Fault is evolutionally more active as compared to the Spilda?? Fault Zone. The geomorphic indices indicate that the Quaternary landscape evolution of the Kemalpa?a Basin was governed by tectonic and erosional processes, and also the all results of morphometric analysis suggest a relatively high degree of tectonic activity along the faults bounding the Kemalpa?a Basin. Moreover, considering that active large normal faults with an average 15 km long can cause major earthquake, the earthquake hazard in the Kemalpa?a Basin should be investigated in detailed paleoseismological studies. 相似文献
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Despite a recent increase in the number of vulnerability analyses there has been relatively little discussion of vulnerability
assessment of social–environment system, especially when they face multiple hazards. In this study, we developed an applicable
and convenient method to assess vulnerability of social–environment system at a regional scale. Vulnerability is quantified
by measuring three critical elements (i.e. hazards, sensitivity, and resilience) through some key variables. The results showed
that vulnerability is high in Miaofeng Mountain in Mengtougou District, the hills of Pinggu County and the riparian zones
of the lower courses of the Beiyun and Yongding Rivers; but low in the city of Beijing and the southwestern part of the Fangshan
District. Areas of very high, high, medium, and low-vulnerability account for 6.19, 25.48, 33.06, and 35.27% of the total
area, respectively. The degree of vulnerability decreases in a northwest direction in mountainous areas and declines from
watercourses to riparian zones along a lateral direction in the plain. Some adaptive strategies are also proposed. 相似文献
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NIU Baogui HE Zhengjun SONG Biao REN Jishun XIAO Liwei Institute of Geology Chinese Academy of Geological Sciences Beijing Beijing SHRIMP Centre Beijing 《《地质学报》英文版》2004,78(6)
A zircon U-Pb geochronological study on the volcanic rocks reveals that both of the Zhangjiakou and Yixian Formations, northern Hebei Province, are of the Early Cretaceous, with ages of 135-130 Ma and 129-120 Ma, respectively. It is pointed out that the ages of sedimentary basins and volcanism in the northern Hebei -western Liaoning area become younger from west to east, i. e. the volcanism of the Luanping Basin commenced at c. 135 Ma, the Luotuo Mount area of the Chengde Basin c. 130 Ma, and western Liaoning c. 128 Ma. With a correlation of geochronological stratigraphy and biostratigraphy, we deduce that the Xing'anling Group, which comprises the Great Hinggan Mountains volcanic rock belt in eastern China, is predominantly of the early-middle Early Cretaceous, while the Jiande and Shimaoshan Groups and their equivalents, which form the volcanic rock belt in the southeastern coast area of China, are of the mid-late Early Cretaceous, and both the Jehol and Jiande Biotas are of the Early Cretaceous, not L 相似文献
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NIU Baogui HE Zhengjun SONG Biao REN Jishun XIAO Liwei Institute of Geology Chinese Academy of Geological Sciences Beijing Beijing SHRIMP Centre Beijing 《《地质学报》英文版》2004,78(6)
A zircon U-Pb geochronological study on the volcanic rocks reveals that both of the Zhangjiakou and Yixian Formations, northern Hebei Province, are of the Early Cretaceous, with ages of 135-130 Ma and 129-120 Ma, respectively. It is pointed out that the ages of sedimentary basins and volcanism in the northern Hebei -western Liaoning area become younger from west to east, i. e. the volcanism of the Luanping Basin commenced at c. 135 Ma, the Luotuo Mount area of the Chengde Basin c. 130 Ma, and western Liaoning c. 128 Ma. With a correlation of geochronological stratigraphy and biostratigraphy, we deduce that the Xing'anling Group, which comprises the Great Hinggan Mountains volcanic rock belt in eastern China, is predominantly of the early-middle Early Cretaceous, while the Jiande and Shimaoshan Groups and their equivalents, which form the volcanic rock belt in the southeastern coast area of China, are of the mid-late Early Cretaceous, and both the Jehol and Jiande Biotas are of the Early Cretaceous, not L 相似文献
10.
New rurality and the experience of place: the small rural locality of La Niña,Buenos Aires,Argentina
This paper presents a cultural geographic approach for understanding local social processes of territorial re-appropriation taking place in response to non-local forces and interests. This approach is applied to the small rural locality of La Niña, in Buenos Aires Province, Argentina. The small village of La Niña is currently in a locally-led process of recovering from a recent depopulation trend caused mainly by the irruption of transnational agribusiness. As economic opportunities have dwindled in the last decades, more recently local inhabitants and new settlers have set forth diverse strategies aimed at mitigating the effects of depopulation on the social structure. We focus our attention on the way the living experience of place is involved in all these strategies. We contend that despite economic and cultural homogenization caused by globalization, the experience of place is a permanent though ever-changing aspect of social life. Our research was based on archival and hemerographic surveys and ethnographic field techniques, encompassing participatory observation, semistructured and in-depth interviews with social and government leaders and local producers as well as field landscape appraisals. 相似文献
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A stratotypical section of the Oligocene–Lower Miocene Maikop Group in the valley of the Belaya River above the city of Maikop was studied using a complex paleobotanical method. The hydrological regime of marine basin was specified, especially for the second half of the Early Oligocene, when the basin was brackish. Its desalination began prior to accumulation of the ostracod layers and continued until the beginning of the Late Oligocene. It was once interrupted by short-term ingression of seawater into the Paratethys in the Early Morozkina Balka time. The Karadzhalga and Septarian formations were formed at the end of the Oligocene and in the Early Miocene under frequent oscillations of climate and hydrological regime with accumulation of sediments within the Laba delta front. The complexes of plant microfossils, along with dominant recent marine organic-walled freshwater phytoplankton, contain algae, spores, pollen, and a huge amount of redeposited palynomorphs. They originated from areas of erosion and included Paleogene, Mesozoic, and, locally, Paleozoic taxa. 相似文献
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《Geoforum》2002,33(2):195-219
This paper attempts a two-tiered analysis of what has come to be referred to as the `security-park', i.e., that South African variation of the `gated community' which combines Blakely and Snyder's [Fortress America: Gated communities in the United States, Brookings Institution Press, Washington, 1999] typically separable `lifestyle', `prestige' and `security zone' gated community types. The first part of this analysis reviews the existing literature on gated communities and relates it back to the South African situation. The second part, both theoretical and empirical, draws on Foucault's [Utopias and heterotopias, in: N. Leach (Ed.), Rethinking Architecture: A Reader in Cultural Theory, Routledge, London, 1997] notion of the heterotopia, and on a variety of textual representations of Dainfern. The heterotopia, as an `analytics of difference' becomes a particularly important means of critique here, drawing attention to security-parks as: (1) possessing a precise and well-defined function within society (a function which typically coalesces around points of social crisis), (2) operating distinctive systems of admission and exclusion, (3) containing certain `juxtaposed incompatibilities' (of which a paradoxical `heterochroneity' is one of the most pronounced elements), (4) embodying – via the espousal of a certain `utopics' – an `alternate mode of social ordering' (in Hetherington's [The Badlands of Modernity: Heterotopia and Social Ordering, Routledge, New York, 1997] term). Each of these analytical strands constitutes a discursive relay through which one might deduce wider networks of social power or in the case of Dainfern or security-parks more generally, historical structures of the race- and class-structuring of privilege and poverty. Representations and practices of the security-park are in this way indicative of a far larger political rationality – a self-justificatory set of entitlements, warrants and exclusionary prerogatives which we have labelled a “rights” of privilege. 相似文献
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Gonçalves Leonardo Alkmim Fernando F. Pedrosa-Soares Antônio Gonçalves Cristiane C. Vieira Valter 《International Journal of Earth Sciences》2018,107(1):337-358
International Journal of Earth Sciences - The Araçuaí-West Congo orogen (AWCO) is one of the various components of the Brasiliano/Pan-African orogenic network generated during the... 相似文献
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1IntroductionUp to now,eutrophication is still a problem af-fecting water quality in many developing countries.Themost important nutrients causing eutrophication arephosphates,nitrates and ammonia(Lijklema,1995;Horne and Goldman,1994).Eutrophic waters are… 相似文献
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《中国地球化学学报》2006,(Z1)
Several former and existing gold and copper mines of the Benguet Province in northern Philippines are situated in the Baloy catchment. Rivers and tributaries drain an area of approximately 89 square kilometers before joining the main Agno River which drai… 相似文献
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DING Xiaozhong GUO Xianpu PENG Yang JI Yunlong WANG Yineng Institute of Geology Chinese Academy of Geological Sciences Beijing China University of Geosciences Beijing Northwestern Bureau of Petroleum Geology SINOPEC Urumqi 《Continental Dynamics》2001,(2)
1. IntroductionThe Tarim basin, one of the most developed and important areas of marine Cretaceous-Tertiary in China except for south Tibet, is very rich in oil and gas, such as Kekeya oilfield in southwestern Tarim and Kela2 gas field in northeastern Tarim. Because of the expansion, subduction of the oceanic crust of the Tethys and the collision between the India plate and the Eurasia plate during the Cretaceous-Tertiary, the Tethys transgressed into the Tarim basin from west to east fr… 相似文献
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Radio-isotopic analysis of single zircons from two early Telychian K-bentonites, one of which is among the most widespread Lower Paleozoic volcanic ash falls in north- ern Europe, yields overlapping weighted mean 206pb/238U ages of 438. 7± 1.0 Ma and 437.8 ± 0.5 Ma, respectively. The former age is from zircons of the Osmundsberg K-bentonite from the type locality at Osmundsberget in the Siljan area of central Sweden where it occurs in the lower part of the Spirograptus tur- riculatus Graptolite Zone and in the lower part of the Angochitina longicollis Chitinozoan Zone. Zircons giv- ing the latter age are from a bed previously identified as the Osmundsberg K-bentonite at the Kallholn Quarry in the same area. Based on new biostratigraphic data, the latter bed is now considered to be slightly younger than the Osmundsberg K-bentonite. The dated stratigraphic level of the ash layers is slightly younger than the base of the Telychian Stage and thus represents a minimum age for the Aeronian/Telychian Stage boundary. A U-Pb age of 〉 438 Ma for the base of this stage, however, is older and in conflict with estimates in the most recent compilation of the Silurian time scale. In view of the fact that only three radio-isotopic dates from the entire Llan- dovery have been previously accepted, this new and biostratigraphically exceptionally well-controlled radio-isotopic date fills an important gap in the Lower Silurian geochronology. 相似文献
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NIUBaogui HEZhengjun SONGBiao RENJishun XIAOLiwei 《《地质学报》英文版》2004,78(6):1214-1228
A zircon U-Pb geochronological study on the volcanic rocks reveals that both of the Zhangjiakou and Yixian Formations, northern Hebei Province, are of the Early Cretaceous, with ages of 135-130 Ma and 129-120 Ma, respectively. It is pointed out that the ages of sedimentary basins and volcanism in the northern Hebei -western Liaoning area become younger from west to east, i. e. the volcanism of the Luanping Basin commenced at c. 135 Ma, the Luotuo Mount area of the Chengde Basin c. 130 Ma, and western Liaoning c. 128 Ma. With a correlation of geochronological stratigraphy and biostratigraphy, we deduce that the Xing‘anling Group, which comprises the Great Hinggan Mountains volcanic rock belt in eastern China, is predominantly of the early-middle Early Cretaceous, while the Jiande and Shimaoshan Groups and their equivalents, which form the volcanic rock belt in the southeastern coast area of China, are of the mid-late Early Cretaceous, and both the Jehol and Jiande Biotas are of the Early Cretaceous, not Late Jurassic or Late Jurassic-Early Cretaceous. Combining the characteristics of the volcanic rocks and, in a large area, hiatus in the strata of the Late Jurassic or Late Jurassic-early Early Cretaceous between the formations mentioned above and the underlying sequences, we can make the conclusion that, in the Late Jurassic-early Early Cretaceous, the eastern China region was of high relief or plateau, where widespread post-orogenic volcanic series of the Early Cretaceous obviously became younger from inland in the west to continental margin in the east. This is not the result of an oceanward accretion of the subduction belt between the Paleo-Pacific ocean plate and the Asian continent, but rather reflects the extension feature, i.e. after the closure of the Paleo-Pacific ocean, the Paleo-Pacific ancient continent collided with the Asian continent and reached the peak of orogenesis, and then the compression waned and resulted in the retreating of the post-orogenic extension from outer orogenic zone to inner part (or collision zone). The determination of the eruption age of the volcanics of the Zhangjiakou Formation definitely constrains the switch period, which began in the Indosinian and finished in the Yanshanian, that is, 140-135 Ma. The switch is concretely the change from the approximate E-W Paleo-Asian tectonic system to the NE to NNE Pacific system, and the period is also the apex of a continent-continent collision and orogenesis of subduction, being consumed and eventually disappearing of the Paleo-Pacific ancient continent, and all the processes commenced in the Indosinian. While the following post-orogenic large-scale eruption in the Early Cretaceous marks the final completeness of the Paleo-Pacific structure dynamics system. 相似文献
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Thomas Foulon Ali Saeidi Romain Chesnaux Miroslav Nastev Alain Rouleau 《Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards》2018,12(1):74-86
The spatial distribution of soil shear-wave velocity and the fundamental period of vibration were selected as input parameters for the determination of potential seismic site effects in the Saguenay region, Canada. The methodology used in this study involved three clear steps. First, a 3D geological model of the surficial deposits was built taking into consideration the type, spatial distribution and thickness of the deposits. Second, representative average Vs values were determined for each of the major soil units. Finally, the average shear-wave velocity from the ground surface to bedrock (Vsav), the shear-wave velocity of the upper 30 m (Vs30) and the fundamental site resonance period (T0) were calculated over a regular grid for the study area. The results include the spatial distribution of the fundamental site resonance period, the average shear-wave velocity in the first 30 m of the ground and the spatial distribution of National Building Code of Canada seismic soil classes for the Saguenay region. 相似文献
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MENG Xianghua GE MingInstitute of Sedimentary Basin China University of Geosciences Beijing E-mail: mengxh@cugb.edu.cn Liu Xinzhu Zhu Xiling 《《地质学报》英文版》2003,77(3):382-401
This paper gives an account of the research that the authors conducted on the cyclic sequences, events and evolutionary history from Proterozoic to Meso-Cenozoic in the Sino-Korean plate based on the principle of the Cosmos-Earth System. The authors divided this plate into 20 super-cyclic or super-mega-cyclic periods and more than 100 Oort periods. The research focused on important sea flooding events, uplift interruption events, tilting movement events, molar-tooth carbonate events, thermal events, polarity reversal events, karst events, volcanic explosion events and storm events, as well as types of resource areas and paleotectonic evolution. By means of the isochronous theory of the Cosmos-Earth System periodicity and based on long-excentricity and periodicity, the authors elaborately studied the paleogeographic evolution of the aulacogen of the Sino-Korean plate, the oolitic beach platform formation, the development of foreland basin and continental rift valley basin, and reconstructed the evolution 相似文献