西沙群岛西琛一井礁序列成岩作用研究

西琛一井０－４００米段是西沙礁序列研究内容最丰富，实验分析最多的全取芯钻 ，通过薄征观察，电子探针分析，不同井深单一属腹足类壳体，同一深度不同沉积物的碳 ，氧稳定同位素测定和Ｍｇ／Ｃａ，Ｍｇ／Ｓｒ分析，对西琛一礁序成岩体环境，作用性质及其特征，进行了全面系统的论述，并提出了泥晶套的非藻类穿忆和白云石化的非混合水成因素。     

Inception and demise of a Neoproterozoic ocean basin: evidence from the Ougda complex,western Hoggar (Algeria)

The Neoproterozoic Ougda magmatic complex occurs within platformal carbonate rocks in the western part of the Pan-African fold belt of the Tuareg shield (NW Africa). It is composed of - 800 Ma old, relatively high P-T (i.e., Grt + Cpx-bearing: P > 5 kbar; T≈900'Q, tholeiitic mafic/ultramafic cumulates and related rocks intruded by intermediate to mafic calcalkali plutons (e.g., Cpx+Hbl-bearing gabbro) and dikes. Apparent contrasts in structural level of crystallization indicate that the calc-alkali rocks are significantly younger than the tholeiites, which temporally correlate with a period of regional extension in this part of Africa. Intrusion of the calc-alkali rocks may have occurred during the formation of an arc after the tholeiitic rocks had been (diapirically?) emplaced within the shelf carbonates, and prior to (> 630 Ma) the Pan-African orogeny. Data reported herein indicate that the Ougda complex records the inception and demise of a Neoproterozoic ocean basin. Similar crustal sections have been described from collisional (e.g., Aleutian islands) and extensional (e.g., Ivreä-Verbano zone) settings, indicating that processes operating in both environments can generate nearly indistinguishable igneous suites; the prevalence of shallow-level calc-alkali rocks in both settings may mask the presence of more mafic, tholeiitic rocks at depth.     

海南旅游资源结构特征与开发评价

文章对旅游资源岍予新的内涵，作为旅游产品开发的资源基础，海南旅游资源可分为自然旅游资源和社会文化旅游资源，两类交流蕴含了三种属性，即自然属性，文化属性和超自然一文化属性。本文在以上资源认知基础上，分析了海南旅游产品开发的交流基础和旅游资源结构特征，并对其核心旅游资源进行了开发性模糊评价，对海南旅游开发具有很强的现实意义。     

景洪市城市发展对气候的影响

利用景洪城郊长期对比观测资料（１９６４－１９９４年），研究了景洪城市发展对气候的影响，结果表明，随着城市的发展，城市热岛现象日趋明显，城郊气温，风速差逐年增大，市区降水量，空气湿度，雾日数，日照时数，直接太阳辐射及总辐射减少趋势明显，而散射辐射有所增加，且城市热岛效应具有明显的季节性，呈现干季强于雨季，干季的夜间强于白天，雨季的白天强于夜间。     

串管海绵一新属——新瓜达卢佩海绵属(Neoguadalupia),兼论塞巴加斯海绵科各属间的关系

本文论述了云南广南董那孟下二叠统生物礁内的串管海绵化石,提出塞巴加斯海绵科具有三个明显演化分枝,这是它们对不同生态环境长期适应的结果。文章讨论了新属Neoguadalupia与相关属的区别,确立了在串管海绵演化史上的地位,并详细描述和讨论了Neoguadalupia elegana gen.et sp.nov.     

Low-grade metamorphism and geotectonic setting of the Macuchi Formation, Western Cordillera of Ecuador

Abstract The Cretaceous-Eocene basic to intermediate marine volcanic rocks of the Mucuchi Formation constitute the Western Cordillera in northern Ecuador. Their chemical features mostly correspond to those of tholeiitic basalts with some calc-alkaline affinities and suggest an oceanic island arc setting. The Macuchi rocks are affected by low-grade, non-deformative metamorphism, characterized by zeolite, prehnite-pumpellyite and lower greenschist facies assemblages. Depth-zonation is suggested by the downward mineral sequence: (i) laumontite+ (pistacitic epidote, pumpellyite + prehnite); (ii) pumpellyite+ prehnite + pistacitic epidote; (iii) actinolite+biotite+ pistacitic epidote + chlorite. This broad zonation and the chemistry of individual minerals point to an interaction between the volcanic rocks and sea-water under a moderate to high thermal gradient (= 75° C/km?). Alteration appears to have been dependent primarily on fluid control (volume, pressure, composition), temperature and reaction kinetics which together partly overshadow the role of load-pressure. Compositional variations of a mineral species at the scale of a contiguous flow or even at the scale of a thin section show that intensity of alteration was spatially uneven depending on rock permeability and consequently, metastable equilibrium commonly exists. However, a progressive approximation to equilibrium as a result of P–T control is shown by the mineralogy. A high f_o2 of the fluid phase is evident from the mineral chemistry. The metamorphism of the Macuchi volcanics is similar to the hydrothermal-burial type produced during the development of a volcanic arc where lavas and volcanoclastics accumulated in a shallow marine environment. However, some of its characteristics point to a transition toward systems defined by a higher T/P ratio such as those found in ocean-floor metamorphism. A model is proposed in which the Macuchi volcanics are assigned to an oceanic island arc generated contemporaneously with a marginal basin which has opened as the outcome of progressive north-south attenuation of the continental crust due to mantle diapirism.     

海南岛东北部海岸沙丘的沉积构造特征及其发育模式

海岸沙丘沉积构造中既有大型交错层理,也具某些区别于内陆沙丘构造的特征,如厚层顶积层的保存及变形层理的普遍存在。 本区海岸沙丘形成于东北季风,沙源来自海滩砂。从海滩后滨向陆地的沙丘类型依次是海岸前丘、横向沙丘和新月形沙丘、抛物线沙丘、纵向沙丘、海岸沙席。其中海岸前丘和沙席为海岸沙丘区别于内陆沙丘的特有类型。本区海岸沙丘的发育开始于3000年前。     

区域地壳稳定性研究的后顾与前瞻

文章回顾了中国区域地壳稳定性研究的历史,划分了其发展阶段,阐述了不同学派的基本观点,分析了该领域面临的新挑战并指出了其未来的发展方向。明确提出,在活动地区选出并评价相对稳定地块(安全岛)作为重大工程场址将是未来的主流。     

将城市热岛效应分析融入GIS中应用于城市规划

介绍了GIS在城市规划中的应用和热岛与城市规划的相互关系，并探讨能否将GIS与城市热环境相结合运用于城市规划设计中。根据某城镇的地表、气候、降雨量、风场等自然因素与人口、政治、经济、文化等人为因素相联系，综合分析设计出最优的生态城市规划方案，满足当代人高质量生活环境的要求，以及整个城市乃至全球的生态发展。     

Insights into operation of the subduction factory from the oxygen isotopic values of the southern Izu–Bonin–Mariana Arc

Abstract Oxygen is the most abundant element in the earth, and isotopic analysis of this element in island arc lavas potentially provides sensitive constraints on the proportion of oxygen recycled from subducted material, relative to that extracted from the mantle. Here we report on 225 new oxygen isotopic analyses of whole‐rock and glass samples, and clinopyroxene separates, from lavas collected from the southernmost 1500 km of the Izu–Bonin–Mariana (IBM) convergent margin. Whole‐rock samples clustered around a mean of 6.11 ± 0.47‰, whereas Mariana Trough glasses and mafic melts, calculated to be in equilibrium with mafic phenocrysts, clustered narrowly around a mean of 5.7‰. These data demonstrate that unequivocal identification of magmatic oxygen requires analysis of fresh glass or mafic minerals, and that the source of southern IBM Arc melts is entirely, or almost entirely, in equilibrium with normal mantle oxygen. If the elemental enrichments characteristic of the subduction component originate in subducted materials, these oxygen isotopic data are most consistent with the interaction of a small amount of sediment melt (<4%; mostly less than 1%) with mantle peridotite to yield the hybrid mantle that melts to form IBM Arc magmas.