Magmatic fluids immiscible with silicate melts: examples from inclusions in phenocrysts and glasses, and implications for magma evolution and metal transport

The first occurrence of immiscibility in magmas appears to be most important in the magmatic–hydrothermal transition, and thus studies of magmatic immiscibility should be primarily directed towards recognition of coexisting silicate melt and essentially non-silicate liquids and fluids (aqueous, carbonic and sulphide). However, immiscible phase separation during decompression, cooling and crystallization of magmas is an inherently fugitive phenomenon. The only remaining evidence of this process and the closest approximation of natural immiscible magmatic liquids and vapours can be provided by melt and fluid inclusions trapped in silicate glasses and magmatic phenocrysts. Such inclusions are often used as a natural experimental laboratory to model the process of exsolution and the compositions of volatile-rich phases from a wide range of terrestrial magmas. In this paper several examples from recent research on melt and fluid inclusions are used to demonstrate the significance of naturally occurring immiscibility in understanding some large-scale magma chamber processes, such as degassing and partitioning of metals.     

广州市会展旅游产业集聚过程及形成机理研究

旅游产业集聚有助于提升区域整体竞争力,促进区域经济持续发展和进一步优化旅游产业空间结构。论文在界定会展旅游产业集聚的基础上,揭示了广州市会展旅游产业集聚过程和形成机理。研究发现,广交会推进广州旅游产业集聚发展。广州会展旅游产业集聚过程经历集聚核形成阶段、点轴集聚阶段和网络集聚阶段,在不同发展阶段影响产业集聚主要因素存在显著不同。政府行为推动会展旅游产业集聚雏形形成,激增旅游需求、集聚规模经济、外部经济以及降低交易费用等因素促进产业集聚逐渐向点轴集聚发展。在网络集聚阶段,集聚不规模效应以及琶洲展馆的全面启用造成旅游企业数量趋于稳定。会展旅游产业集聚是以展馆为核心集聚,展馆在城市中空间布局的变化将导致该类集聚空间迁移。     

The Construction of Gender in Modern Chinese Law: Discrepant Gender Meanings in the Republican Civil Code

This article examines the intersection of law, gender, and modernity during the transitional Republican era (1912–49). It approaches the topic through a critical reading of the Republican Civil Code of 1929–30, and related commentary on the code by Chinese legal experts. By analyzing the gender assumptions embodied in several newly emergent categories of legal regulation, including legal personhood, minimum marriage age, consent, domicile, surnames, marital property, and child custody, the article’s line of questioning reveals how gender meanings helped to shape modern concepts like universality, equality, and freedom. The findings illustrate the ways in which Republican civil law broke with late imperial legal and gender norms tied to Confucian patrilineal ideology and in addition established new legal and gender meanings that helped to consolidate Chinese politics on a republican basis and to reconfigure modern gender difference on a conjugal basis.     

Sedimentological and archaeological fabrics in Palaeolithic levels of the South-Eastern Pyrenees: Cova Gran and Roca dels Bous Sites (Lleida, Spain)

The comparative study of sedimentary fabrics in relation to archaeological fabrics in various levels of the sites of Cova Gran de Santa Linya (Middle and Early Upper Palaeolithic) and the Roca dels Bous (Middle Palaeolithic) has made it possible to analyse the formation dynamics of the deposits and determine the extent of disturbance of the archaeological levels by natural processes. To achieve this, diagrams and two- and three-dimensional indices were calculated from the azimuth and dip angle of natural clasts and artefacts. The results indicate that the sedimentary levels were formed mainly by planar fabric shape gravitational processes (low depositional angles), which differ notably from the archaeological fabrics they contain, characterised by a greater degree of isotropy. This difference in the fabrics would reflect human activity and indicates that the archaeological levels both in Cova Gran and Roca dels Bous have not been subject to significant natural modifications, and are preserved in situ.     

袁枚的“诗”“学”观

袁枚针对清诗目益学问化所露出的弊端,抗声提出诗主性灵,非关学问,于是有人误认为以袁枚为代表的“性灵”诗派轻学浅薄,游学无根。事实上袁枚很重视诗歌与学问的关系,他对“诗”与“学”的关系有三个基本主张：一是诗须有学,二是反对在诗中填书塞典,三是主张化学入诗。他的诗歌没有脱离清诗质厚重学的时代特征,不是清诗的变异,而恰好是这个茂盛园圃里敢于争春怒放的花朵。     

Pre-Clovis in Texas? A critical assessment of the “Buttermilk Creek Complex”

Lithic artifacts from the lowest strata of the Debra L. Friedkin site, located on Buttermilk Creek in central Texas, have been interpreted as an undisturbed pre-Clovis assemblage (Waters et al., 2011a). Stone tools and debitage were recovered from sediments stratified just below diagnostic Clovis artifacts and dated by OSL to between 13.2 and >15.5 cal kya. Invoking commonly observed cultural and natural site formation processes, we offer an alternative explanation of the “Buttermilk Creek Complex” as a Clovis assemblage in secondary association with the dated sediments.     

Understanding faunal contexts of a complex Tell: Tel Dor, Israel, as a case study

The complex stratigraphy of the large Levantine tells and the complexity of human behavior that took place on them, poses a major challenge in understanding site formation processes and their reflection in the faunal remains. We studied the contextual deposition of faunal remains in Tel Dor, as a model for complex tell sites, and the possibility of using faunal remains as a tool to distinguish between context types. In addition, we asked how can we use this knowledge to elucidate site formation processes. Our results demonstrate that most loci defined in the field as primary refuse or purposive disposal are indeed different from the loci defined as secondary refuse. Different types of contexts can be differentiated, to a degree, from one another based upon multivariate analysis of faunal remains. Statistical as well as spatial analyses may help elucidate site formation processes and the use of space. Bones can, and in many cases do, reflect primary activities. Lumping zooarchaeological data into a single ‘assemblage’, as done in most zooarchaeological studies today causes major loss of information. Consideration of the specific location of faunal remains can be used as further indication for context identity and for understanding specific activities in a site, with care this can be done even in complex sites such as the ‘urban mounds’ of the Levant.     

A multi-layered prehistoric settlement structure (tell?) at Niederröblingen,Germany and its implications

At least 15 settlement layers, deposited above each other from the early Neolithic (ca. 5300 cal BC) until Roman Imperial Times (ca. 400 cal AD), have been discovered at Niederröblingen, Germany. Constituting the longest duration of prehistoric settlement in central Europe so far known (ca. 4000 yrs), the site is thought to represent the first multi-layered settlement mound (tell?) north of the Alps. This implicates that the occurrence of settlement mound is not limited to the circum-Mediterranean area. The detailed chronology, based on archaeological, radiocarbon and OSL dating and supporting a Bayesian model, shows one clear occupational gap (early Neolithic) and a possible hiatus (Roman Times). Erosion phases of the settlement mound and the deposition of alluvial sediments (since Roman Imperial Times) in the surroundings resulted in an almost complete disappearance of the mound from the recent scenery. Being difficult to detect, similar sites might be present, undetected, in central Europe. Their discovery and study would enable the precise reconstruction of the settlement history as well as of the prehistoric man–environmental interactions at a high resolution.     

Residential versus civic use in the Pueblo II-III period: A case study from the Harlan Great Kiva site in the Goodman Point area of southwestern Colorado

Abstract

Sites recorded during survey that were occupied or used for long periods of time often present problems in determining when particular activities may have occurred, and what types of activities correspond to which periods of use. The Harlan Great Kiva site, in southwestern Colorado, provides an opportunity to examine sequential residential and civic use of one ancestral Pueblo period site over a period of 250 to 300 years. Pottery recovered during test excavations suggests that it may be possible to recognize changing types of use from surface remains recorded during survey. This analysis may prove useful for survey-level studies of long-lived sites with recognizable civic architecture at the surface.     

The 4th-century B.C. shipwreck at Mazotos,Cyprus: New techniques and methodologies in the 3D mapping of shipwreck excavations

Abstract

Well preserved ancient shipwrecks are rare in the archaeological record, but when discovered, they can provide valuable information on a wide range of research issues if analyzed and documented properly. In this paper we discuss the significance, potential, and constraints of mapping methods applied during the underwater excavation of shipwreck sites with special emphasis on stratigraphy, documentation of finds, and reconstruction of site formation processes. As a case study, we present the digital photogrammetry and computer vision software programs used in the excavation of the 4th-century b.c. shipwreck at Mazotos, Cyprus. Our goal is to develop a targeted documentation and mapping method of ongoing shipwreck excavations so that others can address complex research questions concerning this unique discipline of archaeology.