Cloning and characterization of glyceraldehyde-3-phosphate dehydrogenase encoding gene inGracilaria/Gracilariopsis lemaneiformis

Glyceraldehyde-3-phosphate dehydrogenase （GAPDH） plays important roles in various cellular processes. A cytosolic GAPDH encoding gene （gpd） of Gracilaria/Gracilariopsis lemaneiformis was cloned and characterized. Deduced amino acid sequence of the enzyme of G. lemaneiformis had high homology with those of seven red algae. The 5＇-untranslated regions of the GAPDHs encoding genes of these red algae varied greatly. GAPDHs of these red algae shared the highly conserved glyceraldehyde 3-phosphate dehydrogenase active site ASCTTNCL. However, such active site of Cyanidium caldarium was different from those of the other six algae at the last two residues （CL to LF）, thus the spatial structure of its GAPDH active center may be different from those of the other six. Phylogenetic analysis indicated that GAPDH of G. lemaneiformis might have undergone an evolution similar to those of Porphyra yezoensis, Chondrus crispus, and Gracilaria verrucosa. C. caldarium had a closer evolutionary relationship with Cyanidioschyzon merolae than with Cyanidium sp. Virtual Northern blot analysis revealed that gpd of G. lemaneiformis expressed constitutively, which suggested that it might be house-keeping and could be adapted as an inner control in gene expression analysis of G. lemaneiformis.     

新亚欧大陆桥(河南段)经济带地下水资源形势的研究

新亚欧大陆桥,是又一条连接亚欧大陆的“黄金通道”。陆桥的开通,给河南城市群的崛起和城乡产业经济的发展带来了契机。作为经济可持续发展限制因素之一的地下水资源,在陆桥（河南段）经济带范围内,能否满足沿线经济对地下水的需求？研究结论是：地下水形势不容乐观,潜力尚有８７×１０８ｍ３／ａ,同时还存在超采量３８８×１０８ｍ３／ａ,城乡开发地下水强度不一,已引发多种环境地质问题,对陆桥（河南段）经济带的发展构成了严重威胁。为缓和陆桥（河南段）沿线用水矛盾,必须遵循“因地制宜,量水为出,适度开发,统一规划”的原则,在开源、节流、管理上做好用水文章,充分发挥地下水资源的整体效益,实现陆桥（河南段）经济带地下水的可持续开发利用。     

山西义兴寨金矿床地球化学研究

晋东北地区以唐河大断裂为核心的一组早燕山期 NW向张剪性断裂与区域 NE向复向斜复合部位 ,控制着区内燕山期中酸性浅成侵入体及其与之有关的铁、金、铜矿化 ,义兴寨金矿是该地区具代表性的典型矿床。金矿床为热液型脉状金 -多金属矿床 ,矿体受岩体和断裂构造控制。金矿床分 4个成矿期 ,8个亚期。对金矿床的矿床地质特征、成矿流体成分、性质、成矿物理化学条件及成矿时代的研究表明 ,成矿溶液的 p H值为 6 .1 6～ 6 .5 3:Eh值为 -0 .2 81～-0 .2 80 ;lgf O2 =-3.6～ -2 9,lgf CO2 =4 .3～ 5 .2 ;成矿温度为 1 90～ 349℃ ;成矿压力为 2 0 .0～ 76 .0 MPa;矿床主成矿期石英的 40 Ar— 3 9Ar坪年龄为 ( 1 31 .4± 3.1 ) Ma。     

Negative Ce Anomaly in the Indian Banded Iron Formations: Evidence for the Emergence of Oxygenated Deep-Sea at 2.9-2.7 Ga

Abstract: Major and rare earth element contents are reported for Late Archean banded iron formations (BIFs) in the Bababudan Group of the Dharwar Craton, South India. The BIFs are mostly composed of SiO₂ (average1ρ = 54.88.1 wt%) and Fe₂O₃* (44.38.2 wt%). The Al₂O₃ and TiO₂ contents are remarkably low, suggesting that detrital components were starved during the BIF deposition. The BIFs have a LREE-enriched pattern with a relatively high (La/Yb)_N (6.644.07). Total REE concentrations (RE) vary from 5.2 to 65.3 ppm. The REE patterns are characterized by the presence of a very large negative Ce anomaly (Ce/Ce*: 0.13-0.83) and a positive Eu anomaly (Eu/Eu*: 0.96-2.45). The Eu/Eu* decreases and (La/Yb)_N increases with a increase of RE. These correlations of REE indices are similar to those of modern hydrothermal iron-rich sediments near a mid-ocean ridge (MOR). Greenstones associated with the BIFs have MORB-like geochemical features. These geochemical and geological lines of evidence indicate that the depositional site of the BIFs was remote from a continent and/or island arc and that the BIFs were in situ hydrothermal sediments near a MOR. A striking negative Ce anomaly in the BIFs indicates that oxygenated deep-sea environments emerged at 2.9-2.7 Ga. The existence of contemporaneous Mn deposits in the Dharwar Craton supports this assertion. Our scenario of oxygen in the Earth's surface of the Late Archean is different from long-held notion that the atmosphere and ocean were persistently anoxic throughout the Archean.     

含粗粒金矿样品采集加工与分析研究进展

含粗粒金矿,由于粗粒金的存在使其样品的采集、加工和分析极具挑战性,如何获得具有代表性和均匀性的化学分析样品,并提供准确的分析结果,长期以来一直是该类金矿资源勘查评价急待解决的技术难题。本文对近年来国内外含粗粒金矿样品的采集、加工和分析方法等3方面开展的研究工作及主要成果进行归纳分析,认为:1含粗粒金矿样品的采集是确保样品代表性的首要环节,含粗粒金矿样品分析结果的潜在误差有80%来源于样品采集,因此研究经济、有效的样品采集方法至关重要。2含粗粒金矿样品的加工主要从提高自然金的粉碎度,改进加工流程,选择样品加工设备等方面进行,但查明金的粒度分布及伴生矿物是拟定样品加工流程的关键。3含粗粒金矿样品的分析方法有常规的化学分析方法、批量浸金法和人工重砂加权平均法,相对于复杂的加工流程研究,后者有望成为此类样品经济有效的分析方法。本文指出,含粗粒金矿资源评价质量的误差来源于地质、采样、加工、分析等诸多方面,总体而言应最小化所有阶段误差,应特别重视样品采集方法的研究,确保采集样品的代表性是提高该类金矿资源评价质量的前提。     

Meso‐Cenozoic Tectonothermal History of Permian Strata,Southwestern Weibei Uplift: Insights from Thermochronology and Geothermometry

This study provides an integrated interpretation for the Mesozoic-Cenozoic tectonothermal evolutionary history of the Permian strata in the Qishan area of the southwestern Weibei Uplift, Ordos Basin. Apatite fission-track and apatite/zircon(U-Th)/He thermochronometry, bitumen reflectance, thermal conductivity of rocks, paleotemperature recovery, and basin modeling were used to restore the Meso-Cenozoic tectonothermal history of the Permian Strata. The Triassic AFT data have a pooled age of ～180±7 Ma with one age peak and P(χ2)=86%. The average value of corrected apatite(U-Th)/He age of two Permian sandstones is ～168±4 Ma and a zircon(U-Th)/He age from the Cambrian strata is ～231±14 Ma. Bitumen reflectance and maximum paleotemperature of two Ordovician mudstones are 1.81%, 1.57% and ～210°C, ～196°C respectively. After undergoing a rapid subsidence and increasing temperature in Triassic influenced by intrusive rocks in some areas, the Permian strata experienced four cooling-uplift stages after the time when the maximum paleotemperature reached in late Jurassic:(1) A cooling stage(～163 Ma to ～140 Ma) with temperatures ranging from ～132°C to ～53°C and a cooling rate of ～3°C/Ma, an erosion thickness of ～1900 m and an uplift rate of ～82 m/Ma;(2) A cooling stage(～140 Ma to ～52 Ma) with temperatures ranging from ～53°C to ～47°C and a cooling rate less than ～0.1°C/Ma, an erosion thickness of ～300 m and an uplift rate of ～3 m/Ma;(3)(～52 Ma to ～8 Ma) with ～47°C to ～43°C and ～0.1°C/Ma, an erosion thickness of ～500 m and an uplift rate of ～11 m/Ma;(3)(～8 Ma to present) with ～43°C to ～20°C and ～3°C/Ma, an erosion thickness of ～650 m and an uplift rate of ～81 m/Ma. The tectonothermal evolutionary history of the Qishan area in Triassic was influenced by the interaction of the Qinling Orogeny and the Weibei Uplift, and the south Qishan area had the earliest uplift-cooling time compared to other parts within the Weibei Uplift. The early Eocene at ～52 Ma and the late Miocene at ～8 Ma, as two significant turning points after which both the rate of uplift and the rate of temperature changed rapidly, were two key time for the uplift-cooling history of the Permian strata in the Qishan area of the southwestern Weibei Uplift, Ordos Basin.     

舒适度测量仪探测系统开发

舒适度测量仪探测系统主要由采集器、传感器、支架、供水系统、通信模块、数据采集软件6个部分组成.除通信模块之外,其他5个部分都是全新设计.采集器是系统的核心,负责数据的采集、处理和传输;数据采集软件安装在中心服务器上,负责数据的采集、处理、显示和存储,并能远程监测和遥控探测现场的设备.此外,对舒适度的相关理论进行分析,给出适合广州地区的舒适度指数分级标准,并对舒适度测量仪探测数据进行分析.近一年的试运行表明,系统运行稳定、探测数据可靠、适合业务组网的要求.     

Y11B航空物探(电/磁)综合站西北找水初步成果

1997年9月23日～10月8日,在甘肃省安西—敦煌地区用Y11B航空物探(电/磁)综合站和GPS导航定位进行了地下水勘查试生产工作。用均匀大地模型,结合已知的水文地质资料,初步圈定了淡水区、过渡类型水区、咸水区和苦水区及泉水湖。所推断的水质和土壤含盐量与大的水文地质单元和1:20万水文地质普查报告都吻合得很好,且细节更为清楚。对差异较大的地方做了分析和解释。     

四川拉拉铁氧化物铜金矿床（IOCG）形成的矿相学证据

四川拉拉铜矿是我国西南重要的大型铜矿,并且共（伴）生丰富的金—钼—钴—稀土—铁可供综合利用。系统的矿相学研究表明,矿石矿物主要为热液磁铁矿、黄铜矿、黄铁矿、白铁矿和辉钼矿;矿床围岩蚀变种类较多,主要有黑云母化、硅化、碳酸盐化、钠长石化、钾长石化、磷灰石化、阳起石化、萤石化等;矿石结构包括自形- 半自形- 它形晶粒结构、交代残余结构、包含结构和枝状结构,矿石构造包括浸染状构造、条带状构造、脉状- 网脉状构造和角砾状构造;载铜矿物主要为黄铜矿,钴主要赋存于黄铁矿和白铁矿中,钼赋存于辉钼矿中,金主要以自然金或含银自然金形式赋存于黄铜矿、黄铁矿和叶碲铋矿中;磁铁矿中钛含量低,矿石中硫含量低,罕见铅锌硫化物矿物。因此,拉拉铜矿应属于典型的铁氧化物铜金矿床。     

海南岛后地台造山-造盆模型:火成岩地球化学制约

海南岛自海西运动晚幕之后进入后地台活化或地洼阶段，并经历了晚海西-印支期挤压（碰撞）造山、地壳隆起和燕山期以来的块断型造山-造盆作用的过程。火成岩研究资料表明，海南岛地区在晚海西-印支运动期间曾形成一个具有加厚陆壳的后地台造山带；燕山晚期开始出现的裂陷作用是在仍有山根（约60km厚的陆壳）存在的条件下造山带拉伸塌陷阶段的产物；岩石圈底层剥离与地壳山根的去除并最终导致了海南及其邻区从大陆型壳体向陆缘扩张带型壳体的转化。