Geochemistry - Science topic

Quaternary stratigraphic records provide evidence at both regional and global scales for climate and sea-level changes, as well as faunal and floral turnover and landscape evolution. These depositional archives that allow studying the geological evolution of the Earth include terrestrial and marine sequences. Marine successions mainly record globa...

An evaluation of the feasible development of geothermal energy in Mozambique is proposed based on some thermal springs geochemical characterization in the Tete region. Chemical and isotopic data suggest that the springs have a meteoric origin and do not show connection with any active magmatic system. The proposed circulation model suggests high de...

Polluted soil is an important source of exposure to potentially toxic elements (PTEs) for humans, especially in urban areas. We studied the fate of PTEs in the total (<2 mm) and fine (<50 µm) fractions of urban soils in playgrounds, passing areas, and vacant lots of the historic mining village of Minas de Riotinto in SW Spain. The mineralogical and...

Neoproterozoic granitoids are widely distributed in the Altyn Tagh, and provide indispensable information on the pre-Cenozoic tectonics and evolutionary history at the northeastern margin of Tibetan Plateau. In this study, zircon U-Pb geochronological results show that the granitoids were emplaced during the interval between 997 Ma and 901 Ma. Petr...

We conducted a quantitative and qualitative bibliometric analysis based on 8740 research articles from the Web of Science Core Collection published in the last 20 years (2000–2020) for a better understanding of the research progress and development trend of arsenic pollution in freshwater (FAP). The results showed a significant increase in the numb...

The formation and alteration of oceanic lithospheric rocks is an emerging subject. However, it is challenging to sample oceanic and sub-oceanic rocks. The fragments of oceanic lithospheres are sometimes tectonically emplaced onto the Earth's surface and preserved as "ophiolites". The ophiolites and associated rocks provide a unique opportunity to s...

Purulia is a hard rock terrain where water scarcity as well as water quality degradation has been a major threat for the past few decades. The prolong use of fluoride contaminated groundwater causes serious health issues in human. The study was performed during the post-monsoon period for better understanding of the general geochemistry along with...

El presente trabajo fue desarrollado en el Complejo Volcánico Planchón-Peteroa en la provincia de Mendoza, Argentina. Su objetivo es analizar y describir los principales procesos geoquímicos que se desarrollan y controlan la composición de las aguas pertenecientes al sistema hídrico del complejo volcánico. Dichas aguas fueron clasificadas a partir...

Porphyry deposits are the world's most important source of Cu and a major source of Au. It has been recognized that low Au grades generally characterize porphyry deposits in thick continental arcs, like the Andes, where the magmas are likely to differentiate at depth. In contrast, Au-rich porphyries are mainly found in thin island arcs, for example...

Lakes in the northeast United States are recovering from acidification, but it is unclear if species assemblages will return to pre-acidification conditions, in light of new, interacting climate change pressure. This study explored the impact of past acidification on Beaver Pond, an acid-impaired lake in Vermont, USA. We analyzed long-term seasonal...

Saxicolous lichen distribution survey has not been conducted to date in Nigiris. We investigated a lichen survey of saxicolous species from charnokite, granite, quartzite and granite gneiss at the GudalurCherambadi, Masinakudi and Doddabetta. Analysis of rocks in relation with saxicolous lichen using spectrophotometric analysis revealed significant...

How to cite this article: Smolkin V.F., Mokrushin A.V., Bayanova T.B., Serov P.A., Ariskin A.A. Magma feeding paleochannel in the Monchegorsk ore region: geochemistry, isotope U-Pb and Sm-Nd analysis (Kola region, Russia). Abstract. A comprehensive study of a 340 m thick lenticular-sheet body of ultramafic composition penetrated by structural well...

Abundant Jurassic magnetite-rich W–Sn and magnetite-poor Cu skarn deposits were discovered in the Nanling Range of South China. However, their ore-forming processes and the mechanism of differentiated magnetite enrichment are still poorly constrained. The Huangshaping represents a typical skarn deposit in the Nanling Range, which developed both W–M...

Evaluating the coupling of moisture content with supercritical CO2 (ScCO2) in coal is important for CO2 geological sequestration and enhanced coalbed methane recovery. Changes of minerals and microstructure in bituminous coal after ScCO2-water treatment were explored employing X-ray powder diffraction and micro-computed tomography (CT), and the see...

Pegmatitic deposits of critical metals (e.g., Li, Ta, Be) are becoming increasingly significant, with growing interest in understanding metal enrichment processes and potential vectors to aid the discovery of new resources. In southeast Ireland, the Leinster pegmatite belt comprises several largely concealed Li-Cs-Ta albite-spodumene-type pegmatite...

The North China craton of central Asia is a natural laboratory for investigating early Earth tectonic processes including subduction and large-scale horizontal crustal motions. However, it remains unclear how and when the North China craton formed from the amalgamation of several blocks and orogens including the Archean Western and Eastern blocks,...

The late Archean (3.0–2.5 Ga) is a pivotal period, when properties of the continental crust significantly changed and a fundamental shift of geodynamic processes took place. As the major felsic component in early Archean (> 3.0 Ga) crustal records, tonalite-trondhjemite-granodiorite (TTG) suites are compositionally different to the present-day fels...

The middle Eocene Dongying sag in the Bohai Bay Basin of China has an estimated shale oil resource of approximately 1.1 billion t (8.06 billion bbl); flows of shale oil have been produced in the succession from tens of wells, where the daily production of a single well generally varies between 10 and 100 t (73.3-733 bbl). Therein, the mudrock succe...

Merensky reef drilled ahead of development and subsequently mapped in the stopes has been analysed in detail for a range of elements. Silicate mineral chemistry was determined on one intersection. The major rock types are defined by the geochemistry, notwithstanding the petrographic and textural variability. Footwall and hanging wall norite and leu...

The Lebowa Project in the northeastern Bushveld Complex is one of the principal PGE mining areas having been in operation for over 30 years. However, a rigorous evaluation and expansion program commenced only in 2001. We detail the history and impact of this exploration program on the understanding of the mineralization from the mining perspective....

High-level natural radioactivity, geochemical, geological, and radiological hazard assessment of the poorly investigated Wadi Gebeiy Dokhan volcanics rocks are discussed. Wadi Gebeiy Dokhan volcanics are located in Southwestern Sinai, Egypt, covering an area of ~1.3 km2. Dokhan volcanics rocks are represented by porphyritic dacite. Geochemically, t...

Peralkaline igneous rocks are important parental materials for secondary, regolith-hosted ion-adsorption critical metal deposits. Little work has been completed to assess the potential for this style of mineralisation in Queensland. Here, we present the results of a simple reconnaissance study aimed at evaluating the relative enrichment of rare ear...

Geochemical analysis results are one of the most significant indicators that reveal the characteristics of the geological structures in a region. In particular, the differences in the composition of complex geological structures can be evident in field and Geographic Information Systems (GIS) studies. Turkey includes a character consisting of quite...

To better understand geodynamic implications for the transition from adakitic to non-adakitic magmatism in a continental collision setting, an integrated study including zircon U–Pb ages and whole-rock geochemistry was performed for the Gahai and Erhai granitoid intrusions within the Qilian Block. The ca. 450–428 Ma Gahai biotite granite and Erhai...

Forty one representative profiles of Northern Cameroon Vertisols on lowland and upland areas under tropicalseasonally contrasted climate were investigated to assess the genesis of smectite and vertisolization processes on their geochemistry relation. Macro-micromorphological, physico-chemical, mineralogical and geochemical properties were determine...

The Truong Son orogenic belt (TSOB) is one of the most important orogenic belts in the Indochina block. There are numerous mafic to felsic intrusions in the Early Paleozoic caused by the Tethyan orogeny. However, the tectono-magmatic evolution of the TSOB in the Early Paleozoic is still unclear. In this paper, zircon U-Pb dating, whole-rock geochem...

Major and trace element variation and discrimination diagrams from Gwagwada, Central Nigeria show that the I-type granites of probably deep crustal source of post collision transcurrent geological setting was influenced by older basement materials during emplacement based on the average A/CNK (1.54), Na 2 O (3.8), lack of normative corundum as well...

Coal and organic-rich shale in the Yan’an Formation in the southwestern margin of the Ordos Basin are widely developed, which is an important fact for oil and gas exploration in China that has been widely explored for a long time. In this paper, detailed sequence division and sedimentary environment analyses of the Yan’an Formation in the Pengyang...

Purpose High chromium (Cr) in groundwater is a potential environmental issue worldwide that seriously threatens people’s health. However, which Cr forms and species in aquifer solids control Cr mobility in the sedimentary aquifer is poorly understood. We hypothesize that Cr(VI) species, Cr(III) oxidation potential, and the potential of Cr(VI) relea...

The Caspian Sea is exposed to numerous anthropogenic activities such as untreated wastewater discharge and agricultural activities which increased trace metals contamination. The current study was employed to assess the distribution, ecological risk assessment, and source identification of some trace metals in 125 samples of surface sediments and s...

The anomalous enrichment of the rare earth elements and yttrium (REY), U, Mo, As, Se, and V in the coal-bearing intervals intercalated within the carbonate successions in South China has attracted much attention due to the highly promising recovery potential for these elements. This study investigates the mineralogical and geochemical characteristi...

The geochemistry and mineralogy of sediments provide relevant information for the understanding of the origin and metallogenic mechanism of ferromanganese nodules and crusts. At present, there are still few studies on the sediment origin of the Clarion–Clipperton Zone (CCZ) of the east Pacific, particularly on the systematic origin of sediments wit...

Plain Language Summary The returned Chang'e‐5 (CE‐5) samples from one of the youngest mare units in northern Oceanus Procellarum on the Moon provide vital clues about late lunar thermal evolution and post deposition processes (e.g., space weathering and mixing effects) on the lunar surface, presenting quite different chemistry from typical Apollo s...

The Qin-Hang Metallogenic Belt (QHMB), an important metallogenic belt in South China, hosts Cu and W–Sn polymetallic deposits. The Tongshanling ore field in the QHMB is characterized by the coexistence of Cu- and W-bearing polymetallic deposits, which are related to granodiorite and granite porphyry. This study examined whole-rock geochemistry, geo...

Los depósitos epitermales de alta sulfuración albergan principalmente importante mineralización de Au-Ag (-Cu). La franja de El Indio-Pascua es una franja metalogénica de edad miocena que comprende importantes depósitos epitermales de alta sulfuración tale como Pascua-Lama, Veladero, Sancarrón, El Indio, Tambo y Alturas (Figura 1.1). Algunos de...

Geochemical profiles in pore water of marine sediments have been considered as, important indicators of gas hydrate occurrence. In the gas hydrate area around the world, the decrease of sulfate, calcium, and magnesium concentrations with depth mainly results directly or indirectly from the anaerobic oxidation of methane (AOM). The ubiquitous abnorm...

The paper discusses the geochemistry of major (EPMA) and trace (SIMS) elements in olivine of porphyritic, nonporphyritic chondrules, and the matrix of equilibrated ordinary chondrite Saratov (L4). Olivine corresponds to forsterite and is rather heterogeneous (Fo 73-77). No differences in the content of the major elements in the olivine of the chond...

The geochemistry of rare earth elements and yttrium (REY) in phosphorite has been widely studied. However, the effect of organic matter on REY enrichment has not been well determined. We utilized paired inorganic (δ13Ccarb) and organic (δ13Ccarb) carbon isotopes, total organic carbon (TOC), and REY content (∑REY) of the Zhijin Motianchong (MTC) pho...

Hegang coalfield is one of the areas with abundant coal resources in Heilongjiang Province. Characteristics of minerals and geochemistry of No. 26 coal (lower Cretaceous coals) from Junde mine, Hegang coalfield, Heilongjiang province, China, were reported. The results showed that No. 26 coal of Junde mine is slightly enriched in Cs, Pb, and Zr comp...

Purpose of Review In this article, I consider how ideas about the role of mathematics in the formation of landscape studies as those lying between inexact (descriptive) and exact (physical) sciences have changed historically. In his little-known work of 1888, V. V. Dokuchaev answered the question of what was required for a descriptive science, like...

El presente trabajo incluye el análisis estratigráfico de un barreno, muestreo de diversos pozos y análisis químicos de agua subterránea y superficial en la región de Chihuahua, Chihuahua, México, el cual permite documentar la interacción del agua subterránea con el medio geológico por el cual fluye. El análisis estratigráfico y petrográfico del ba...

Geothermal energy is considered a renewable, clean, and environmentally friendly energy source. In addition, it is efficient and relatively cost effective. Therefore, the demand for the development and utilization of geothermal resources is increasing annually. To understand the current status and developments within the context of geothermal resea...

SHRIMP zircon ages, Hf-in-zircon isotopic compositions and whole rock geochemistry were analyzed on basement metamorphic rocks from drill cores collected from the northeastern margin of the Ordos Basin. Geochemical data from four metasedimentary rocks show large varia-tions in major element compositions, but have similar REE patterns and trace elem...

The Middle Triassic Leikoupo Formation is largely extended through the Sichuan Basin, SW China. In this formation, several commercially exploited gas reservoirs have been discovered in western and central parts of the basin. Due to the complicated geochemical signatures of the natural gases in these reservoirs, there are contrasted interpretations...

The Kirari-Abakuri magmatic complex is exposed within the Dizi Series of the Southern Slope zone of the Greater Caucasus. In the Bathonian time, the rocks of the Dizi Series were intruded by the Kirari-Abakuri magmatic complex. The complex includes the Kirari and Abakuri intrusions and the intrusions of the village Dizi, and numerous smaller bodies...

Purpose of Review We have analyzed the history of formation and development of the landscape approach to the rational organization of agrolandscapes in Russia. The main stages of the development of agrolandscape theory and its introduction into practice have been revealed. This process has been going on for the last 120 years and has resulted in su...

The sedimentary strata in the Lingshan Island area are gaining attention because of their unique sedimentary and tectonic characteristics. However, the provenance and the depositional and tectonic setting in this area remain the focus of controversy. There is a significant slump deposit with lateral length up to 250 m in the Laohuzui section at the...

Geochemistry is the study of the development, and distribution of chemical elements on Earth, which are found in rock-forming minerals and their byproducts, as well as in living beings, water, and the environment. The elemental geochemical variation of sediments is used to recognize the mechanisms controlling the estuarine environment and serves as...

Exploration for rare earth element (REE)-deposits hosted in carbonatites and associated rocks is challenging because of the heterogeneous distribution of REE and the variable and often complex mineralogy of such REE mineralisation. The Kieshöhe in southwestern Namibia is a subvolcanic intrusion consisting of calcite-carbonatite, dolomite-carbonatit...

The Caucasian mineral water (CMW) region is a unique area where mineral waters differ by their chemical composition and balneological properties. The presence of a wide range of mineral waters with various ions and gas components and different genesis and their therapeutic properties in the restricted area is explained by complicated geological and...

Mercury (Hg) enrichment and elevated ratios of Hg to total organic carbon (Hg/TOC) in sedimentary rocks have often been linked to volcanism from large igneous provinces (LIPs). Primary Hg and TOC contents of sediments can be altered by secondary processes like extreme weathering. These effects must be evaluated before tying Hg anomalies in weathere...

The tectonic setting of the Xigaze ophiolite of southern Tibet has been debated ever since it was first described 1981. It lies in the central part of the Yarlung Zangbo but differs from adjacent ophiolite by having a relatively thin crustal section, an oceanic core complex and complex geochemistry. It is overlain by radiolarian cherts suggesting a...