影响蔬菜品质的生态地球化学因素研究

阐述湖北省嘉鱼蔬菜基地规模化种植区生态地球化学与蔬菜品质相关的生态系统土、水、农作物蔬菜体系内有益组分、有害污染物的分布状态及迁移、富集规律,进而对蔬菜品种与地球化学背景以及影响蔬菜品质的生态地球化学制约因素进行分析和研究,结果表明区内土壤质量相对安全,达到无公害蔬菜种植标准。

朝阳营子地区地化异常与铅锌矿的关系

通过地球化学测量可以圈定出元素浓集异常区,在异常区内通过各种手段查证可以确定出矿化体。因此地球化学测量对寻找矿化体有指导性的作用。但是具体表现在哪几个方面那?通过对朝阳营子地区地化异常以及该地区铅锌矿体的研究,基本上可以推断出地化异常与矿化体的几种关系,即地化异常指引矿化体的空间位置、指示其空间形态、推断其成矿元素、推断其地表规模。

Geochemistry of intrusive rock in Dachang tin-polymetallic ore field, Guangxi, China: Implications for petrogenesis and geodynamics

The major element, trace element and rare earth element（REE） of the intrusion rock from the Dachang ore field in Guangxi, China, were analyzed. The results show that the phenocryst（about 15%） and matrix（about 85%） mainly consist of quartz, K-feldspar and plagioclase. The rock is composed of low content of Si and high content of Al2O3, low contents of Ca, Fe2O3, Na, TiO2, etc. The intrusion rock has the medium alkali content, attributing to K-rich type rock; and contains medium to low REE contents, of which light rare earth elements（LREEs） and heavy rare earth elements（HREEs） are highly fractionated, showing a weak negative Ce anomaly and a negative Eu anomaly. These rocks are enriched in LREE, and the large ion lithophytes elements（LILE） are rich in Rb, Sr, and U; the high-field-strength elements（Nb, Th, etc） are relatively depleted. The REE chondrite-normalized patterns are consistent with the overall, roughly indicating their similar characteristics, sources and evolution. The intrusion rock mainly formed during the collisional and within-plate periods.

Geochemistry of sedimentary rocks from Permian–Triassic boundary sections of Tethys Himalaya: implications for paleo-weathering, provenance, and tectonic setting

The geochemical characteristics of two sections—the Permian–Triassic boundary(PTB) Guryul Ravine section, Kashmir Valley, Jammu and Kashmir,India; and the Attargoo section, Spiti Valley, Himachal Pradesh, India—have been studied in the context of provenance, paleo-weathering, and plate tectonic setting.These sections represent the siliciclastic sedimentary sequence from the Tethys Himalaya. The PTB siliciclastic sedimentary sequence in these regions primarily consists of sandstones and shales with variable thickness. Present studied sandstones and shales of both sections had chemical index of alteration values between 65 and 74; such values reveal low-to-moderate degree of chemical weathering. The chemical index of weathering in studied samples ranged from 71 to 94, suggesting a minor K-metasomatism effect on these samples. Plagioclase index of alteration in studied sections ranged from 68 to 92, indicating a moderate degree of weathering of plagioclase feldspars. The provenance discriminant function diagram suggests that the detritus involved in the formation of present studied siliciclastic sedimentary rocks fall in quartzose sedimentary and felsic igneous provenances. These sediments were deposited in a passive continental margin plate tectonic setting according to their location on a Si_2 O versus K_2O/Na_2 O tectonic setting diagram.

Trickster or Colonizer： The Latent Effects of Colonialism in Efua Sutherland＇s Play The Marriage of Anansewa

The essay analyzes the play written by the late Efua Sutherland （from Ghana） and shows the effects of colonization among the Ghanaians. First, it explores the historical inroads made by the colonizer in West African countries, such as Ghana, causing the debilitation of the culture of such countries by erasing its history. One way in which such erasure occurred was in the destruction of sacred sites of the people. Further connections will also be made to West African cultural contexts with the history of colonization in Africa and its effects on popular culture, specifically drama in countries like Ghana. Next, the essay draws upon the role of the trickster figure of Ananse, the spider who features in many West African and Caribbean folkloric traditions. Sutherland＇s play revolves around the main character of the play, Ananse, and he is likened to the trickster figure, but the essay shows how this figure is also debilitated by the colonizer. Finally, in the play, one notes that despite the main character＇s ＂victory＂ in getting his daughter married to the ＂Chief-Who-ls-Chief＇, he does it for his survival and the survival of his daughter in a world in which the latent effects of colonization has hampered the memory and culture of its people.

Thoughts and effects for substituted resource prospecting in Laozuoshan gold deposit in Heilongjiang

According to the Geological settings and the distributed laws of ore bodies and previous research re- suits, combining with latest theories and new methods of geological prospecting, the authors proposed prospec- ting thoughts for substituted resources in Laozuoshan gold deposit. After ore prospecting in two years, nine new blind ore bodies were found, among which four ore bodies contain 4218. 1 kg inferred intrinsic economic re- sources （ 333 ）, and mitigate the crisis situation of mine reserves. At the same time, lots of significant geophysi- cal and geochemical anomalies were found in the peripheral, which provide a basis for further prospecting.

Self and Other in Contemporary German Literature Confrontation With the Foreign World in the Novels by Renate Ahrens

The experience of＂The Other＂ has become a common one for people in the 21st century, and yet it continues to be a major problem for everyone involved. Increasingly, however, immigrants and their descendants adjust and soon participate in and with the new culture（s）. At the same time, those who encounter ＂The Other＂ through the contact with immigrants, have also to adapt, to learn, and to realize considerable changes in themselves in that process. Recently, a new German novelist, Renate Ahrens, has created several major works in which she reflects on this intricate phenomenon typical of our times. The present study might well be the first critical analysis of her last two novels, Zeit der Wahrheit （Time of Truth, 2005） and Fremde Schwestern （Alienated Sisters, 2011）, which prove to be outstanding and first-rate literary treatments of the theme of＂The Other＂ in an intercultural context. As Ahrens illustrates in both novels, each individual carries a heavy baggage imposed on them by the own family history, and so in both cases the confrontation with ＂The Other＂ serves exceedingly well to break open the shell of self-isolation and self-alienation. Love finally overcomes ancient conflicts and paves the way for new integrative forces supporting the formation of the ＂global village＂ we all are really living in.

Diagenesis tectonic setting and U-Pb dating for zircon from Tanjianshan Group in northern margin of Qaidam Basin

The shape,texture,content and REE characteristics of zircons from the O2tnd-1,O3tnd-2,O3tnd-3pyroclastic rock of Tanjianshan Group on the north margin of Qaidam Basin indicate that the O2-3tndis the product of volcanism during the transitional period from ocean-land interim crust to oceanic crust.The U-Pb surface ages obtained from O3tnd-2and O3tnd-3can be divided into 9 groups,every age group coincides with the period when significant tectonic-heat event took place at Oulongbuluke micro-continental base of northern Qaidam,suggesting that the base rocks have provided materials for the formation of sedimentary and volcanic rock in O2-3tnd.The volcanic rocks of O3tnd-3formed at 440 Ma,with time gap 46 Ma to those of O1tna-1and O3tnd-3may represent the minor period that Xitieshan back-arc extension have lasted,the scale of back-arc basin that formed in Xitieshan extension may approach to 1 400 km.Based on the test of ithochemistry data for major elements and analysis of Sr isotope geochemistry for the clastic sedimentary rock in O1tna-2and O3tnd-2,the authors get the conclusion that the O1tna-2and O3tnd-2of Tanjianshan Group may form in back-arc basin environment,while the lithology difference between these two formations may reflect the changes of geodynamic processes as the diagenesis tectonic environment transformed from continental margin depression to adjacent sea basin.

Equations of state for aqueous solutions under mantle conditions

With unique physical and chemical properties, aqueous solutions in the mantle may play important roles for a number of geochemical and geodynamical processes. However, since experimental data available are very limited, people still know little about the aqueous solutions and their interactions with surrounding rocks and melts. From the perspective of thermodynamics, equation of state(EOS) is the key to push forward the modeling of aqueous solutions. Nevertheless, up to now accurate EOSs suitable for the mantle conditions are still in shortage. With discussions over several recognized EOSs, we summarize several ways to enhance the predictability of EOS: utilizing high quality data from molecular simulations, choosing functions with sound physical background, and improving the regression procedures for the empirical parameters. In the meantime, we find that the ion-bearing systems are still the focus of challenges in this area. New developments of experiments and computer simulations effectively deal with these challenges and in-depth understandings of aqueous solutions in the mantle are expected in the near future.

Petrogenesis and tectonic setting of the Queershan composite granitic pluton, eastern Tibetan Plateau: Constraints from geochronology, geochemistry and Hf isotope data

The Queershan composite granitic pluton is located in the north of the late Paleozoic Yidun arc collision-orogenic belt, eastern Tibetan Plateau. The main rock types are coarse-grained porphyritic alkalic-monzonite granite with minor fine-grained porphyritic monzogranite and granodiorite distributed in the eastern and southwestern regions. Here we report their zircon U-Pb ages and geo chemical data. The intrusive contact relations indicate that granodiorite was formed earlier than the alkalic-monzonite granite （105.9±1.3 Ma） and monzogranite （102.6±1.1 Ma）. These suggest that the Queershan composite granitic pluton was formed through three-stage magmatic events. The alkalic-monzonite granite （105.9±1.3 Ma） and monzogranite （102.6±1.1 Ma） are characterized by high SiO2 （73.5%-77.7%）, KzO＋Na20 （6.9%-8.5%）, Ga/AI ratios （2.6-3.4） and low A1203 （11.8%-14.5%）, CaO （0.25%-1.5%）, MgO （0.18%-0.69%）, negative Ba, Sr and Eu anomalies, showing A-type granite affinities. The granodi- orite exhibits lower SiO2, P205 and K20＋Na20 contents, but higher A1203, CaO and MgO contents than alkalic-monzonite granite and monzogranite, showing I-type granite affinity. 176Hff177Hf ratios of the alkalic-monzonite granite and the monzogranite are 0.282692-0.282749 and 0.282685-0.282765, respectively, and with similar cHf（t） values （-0.56 to 1.43 and -0.87 to 1.90 respectively）. They also present similar T1-M2 model ages （1.04-1.22 and 1.07-1.2 Ga respectively）, indicating they may be sourced from a similar rock source, mostly like Kangding Complex. The homogeneity of the Hf isotopic compositions and the absence of the MMEs demonstrate that little depleted mantle materials have contributed to the source. We propose that the Mesoproterozoic crust materials of the Yangtze Craton exist beneath the Yidun arc terrane and support it was a dismembered part of the Yangtze Craton. The A-type granites of Queershan composite granitic pluton are most probably related to the clo- sure of the Bangong-Nujiang Tethys ocean.