Geochemical and mineralogical analysis of stone anchors from west coast of India: provenance study using thin sections,XRF and SEM-EDS

Stone anchors have been recovered along the Indian coast as a part of the maritime archaeological studies at the National Institute of Oceanography (NIO), Goa. Study of stone anchors provides clues to understand the ancient maritime trade contacts of India with other countries. These anchors resemble those found in the Mediterranean Sea, Persian Gulf and Red Sea Coast. Underwater explorations at Bet Dwarka, Dwarka, Goa, Visawada and Somnath have yielded stone anchors of widely varying shapes, sizes and weights ranging between 16 and 410 kg. Sixteen (10 Indo-Arabian, 4 Ringstone and 2 Single hole type) of the total of 269 stone anchors have been studied to determine provenance of rock through petrographic analysis using thin section studies, X-ray Fluorescence (XRF), and Scanning Electron Microscope – Energy Dispersive Spectrometer (SEM-EDS).     

MICRO-CREDIT AND DEVELOPMENT IN NORTHERN VIETNAM

Geographical development economics as reflected in the recent report by World Bank (2009) Reshaping Economic Geography (henceforth WDR-2009) and Sachs' (2005) End of Poverty has placed geographical factors of distance and density at the core of economic development. However, development geography has largely moved beyond a paradigm of modernity. This article seeks to narrow the above disciplinary divide and suggests that explanations of distance and density are not irrelevant but will need to be better integrated to local knowledge, practices and power relations in development schemes which are valued by development geographers. The latter is examined in the context of micro-credit programmes in two lagging areas, Soc Son and Vinh Loc, in northern Vietnam. Drawing from interviews and surveys of 160 female participants, we show that micro-credit, WDR-2009 and Sachs' geographical variables significantly affect poverty levels. However, qualitative interviews also reveal that the effects of distance, density and micro-credit schemes are constituted differently in the two areas. Relative to their Vinh Loc counterparts, Soc Son's participants experience less distance and density problems but are confronted with greater vulnerability to coercive relations of rule. In contrast, the approach to rule in the more geographically distressed area of Vinh Loc is underscored by flexibility and compromise which seek to cultivate conditions that sustain local livelihoods.     

Urban and Rural Definitions in Regional Context: A Case Study on Turkey

Transformations in the urban and rural areas under the effects of global economic, social and political circumstances have rendered their boundaries more blurring. It has become increasingly difficult to make a clear distinction between urban and rural. This paper intends to bring definitions of urban–rural into discussion in the context of Turkey. It reveals the results of a research project (conducted by Hürriyet G. Ö?dül with Serkan Öngel and Habip Uluçay from Mimar Sinan Fine Arts University, Istanbul, Turkey, in 2007 and financed by the Scientific and Technical Research Council of Turkey and Mimar Sinan Fine Arts University Research Fund), aiming at revealing the degrees of the urbanity and rurality throughout the country, with an emphasis on the diversification of regions in the urban–rural context. The study is conducted at the NUTS 4 level. Districts are classified as “dominantly rural, dominantly urban and transitional” through the factor analysis based on six structures: agricultural production, non-agricultural production, employment, demography, education and flows of money, goods and people. The urban–rural profile of the country is found as rural and transitional. It is possible to observe some areas displaying deep rural characters in well-developed western regions and some “prosperity spots” dispersed throughout the less-developed eastern regions. Then, regional classifications ranging from “concentrated urban regions” to “rural regions” are made at the NUTS 1 level. Finally, the results are evaluated in perspectives of spatial planning of Turkey and entering process to the EU.     

动态的变化管理与景观文化遗产的可持续性

城镇景观和自然景观是室外环境中非常重要的两个方面,他们之间是既相互关联又相互区别的。景观似乎是既简单又熟悉的概念,在许多文化中,景观有着各种宜人的事物关联性,比如与天堂和美丽,诗歌及绘画等观念。也许这种情形的后果之一就是人们很容易去认为与景观相联系的所有问题也都是简单、熟悉、好看和相对容易的。当人们把景观与通常被看作是景观对应物的城镇和工业环境相比较时,这种态度又得到了进一步的加强。可是在经过较长时间的实践和更仔细的考察以后显示,即使不如城镇和工业环境那样复杂,景观仍然是非常复杂的;这些景观是动态的,也是活生生的。除此以外,它们也常常是城市和城市化、工业和工业化地区中非常重要的组成部分。     

On sampling the upper crustal reservoir of the NE Pacific Ocean

The oceanic upper crustal reservoir is a 600‐m thick layer of porous and permeable basaltic rock that forms the uppermost igneous basement underlying the global ocean. Pore spaces within this fluid aquifer contain a significant fraction of the global seawater, and active circulation through this reservoir has profound influence on the chemical composition of the ocean, strongly impacting the biological environment near the sea surface. Because of the relative inaccessibility of the deep seafloor, where hydrothermal fluid discharges and seawater re‐charges the oceanic crustal aquifer, our understanding of the dynamic physical, chemical and biological processes is strongly dependent on our ability to obtain uncontaminated samples from this challenging environment. Recent technological advances have addressed some, but certainly not all of these sampling problems, providing new data and samples that test our current hypotheses about the crustal fluid reservoir. Current scientific interest in the sub‐seafloor biosphere has focused on the uppermost igneous oceanic crust as likely to be one of the most habitable environments, because of its porosity and locus of hydrothermal circulation of chemical nutrients. Recent observations indicate that sub‐seafloor crustal environments harbor novel CO₂‐utilizing bacteria (primary producers) that could be a significant source of carbon‐fixation in the ocean, thus broadening possible habitable zones both on Earth and elsewhere where microbial life could exist independent of nutrient input from photosynthesis.     

Granite‐related overpressure and volatile release in the mid crust: fluidized breccias from the Cloncurry District,Australia

The source and transport regions of fluidized (transported) breccias outcrop in the Cloncurry Fe‐oxide–Cu–Au district. Discordant dykes and pipes with rounded clasts of metasedimentary calc–silicate rocks and minor felsic and mafic intrusions extend several kilometres upwards and outwards from the contact aureole of the 1530 Ma Williams Batholith into overlying schists and amphibolites. We used analytical equations for particle transport to estimate clast velocities (≥20 m sec^?1), approaching volcanic ejecta rates. An abrupt release of overpressured magmatic‐hydrothermal fluid is suggested by the localization of the base of the breccias in intensely veined contact aureoles (at around 10 km, constrained by mineral equilibria), incorporation of juvenile magmatic clasts, the scale and discordancy of the bodies, and the wide range of pressure variation (up to 150 MPa) inferred from CO₂ fluid inclusion densities and related decrepitation textures. The abundance of clasts derived from depth, rather than from the adjacent wallrocks, suggests that the pressure in the pipes was sufficient to restrict the inwards spalling of fragments from breccia walls; that is, the breccias were explosive rather than implosive, and some may have vented to the surface. At these depths, such extreme behaviour may have been achieved by release of dissolved fluids from crystallizing magma, in combination with a strongly fractured and fluid‐laden carapace, sitting under a strong, low permeability barrier. The relationship of these breccias to the Ernest Henry iron‐oxide–Cu–Au deposit suggests they may have been sources of fluids or mechanical energy for ore genesis, or alternately provided permeable pathways for later ore fluids.     

Hydraulic observations from a 1 year fluid production test in the 4000 m deep KTB pilot borehole

A long‐term pump test was conducted in the KTB pilot borehole (KTB‐VB), located in the Oberpfalz area, Germany. It produced 22 300 m³ of formation fluid. Initially, fluid production rate was 29 l min^?1 for 4 months, but was then raised to an average of 57 l min^?1 for eight more months. The aim of this study was to examine the fluid parameters and hydraulic properties of fractured, crystalline crusts as part of the new KTB programme ‘Energy and Fluid Transport in Continental Fault Systems’. KTB‐VB has an open‐hole section from 3850 to 4000 m depth that is in hydraulic contact with a prominent continental fault system in the area, called SE2. Salinity and temperature of the fluid inside the borehole, and consequently hydrostatic pressure, changed significantly throughout the test. Influence of these quantities on variations in fluid density had to be taken into account for interpretation of the pump test. Modelling of the pressure response related to the pumping was achieved assuming the validity of linear Darcy flow and permeability to be independent of the flow rate. Following the principle ‘minimum in model dimension’, we first examined whether the pressure response can be explained by an equivalent model where rock properties around the borehole are axially symmetric. Calculations show that the observed pressure data in KTB‐VB can in fact be reproduced through such a configuration. For the period of high pumping rate (57 l min^?1) and the following recovery phase, the resulting parameters are 2.4 × 10^?13 m³ in hydraulic transmissivity and 3.7 × 10^?9 m Pa^?1 in storativity for radial distances up to 187 m, and 4.7 × 10^?14 m³ and 6.0 × 10^?9 m Pa^?1, respectively, for radial distances between 187 and 1200 m. The former pair of values mainly reflect the hydraulic properties of the fault zone SE2. For a more realistic hydraulic study on a greater scale, program FEFLOW was used. Parameter values were obtained by matching the calculated induced pressure signal to fluid‐level variations observed in the KTB main hole (KTB‐HB) located at 200 m radial distance from KTB‐VB. KTB‐HB is uncased from 9031 to 9100 m and shows indications of leakage in the casing at depths 5200–5600 m. Analysis of the pressure record and hydraulic modelling suggest the existence of a weak hydraulic communication between the two boreholes, probably at depths around the leakage. Hydraulic modelling of a major slug‐test in KTB‐HB that was run during the pumping in KTB‐VB reveals the effective transmissivity of the connected formation to be 1 to 2 orders of magnitude lower than the one determined for the SE2 fault zone.     

Human and animal diet at Conchopata, Peru: stable isotope evidence for maize agriculture and animal management practices during the Middle Horizon

This paper reports δ¹³C and δ¹⁵N values for human and animal skeletal remains from the Middle Horizon (AD 550–1000) site of Conchopata in the Peruvian highlands. The data indicate that maize was the dietary staple for both humans and the majority of animals at this urban site. Camelids at the site segregated into two groups according to δ¹³C values, reflecting two distinct animal management strategies. Human infants were found to have elevated δ¹⁵N values, reflecting the trophic level effect of breastfeeding. No sex based differences in diet were observed.