Manoel Jerônimo Moreira Cruz

The Potassic Calc-Alkalic Itaporanga Batholith, Northeastern Brazil: Mineral Chemistry and Oxygen-Isotope Data

The Itaporanga batholith (state of Paraiba, northeastern Brazil) is composed of an intimate association of potassic, calc-alkalic, porphyritic quartz monzonitic to granitic rocks and biotite diorites. Net-veined structures demonstrate that the main petrogenetic process during evolution of this batholith involved coexistence and local mixing of magmas. In this work, mineral chemistry and oxygen-isotope data are discussed as an attempt to establish the origin of these magmas. Temperatures obtained through mineral chemistry vary from 690° to 730° C for felsic and mafic rocks, suggesting control by the processes of mingling and mixing of magmas. Chemistries of amphibole and biotite are controlled by the bulk chemistry of K-dioritic to quartz monzodioritic and porphyritic quartz monzonitic rocks, which were influenced by coexistence and local mixing of magmas. A biotite diorite enclave that did not equilibrate with the host quartz monzonite has amphibole and biotite compositions that differ from those diorites...

Geochemistry and Petrogenesis of Siwana Peralkaline Granites, West of Barmer, Rajasthan, India

Abstract The bimodal Malani suite, West of Barmer, Rajasthan is characterized by discontinuous, ring shaped outcrops of Siwana peralkaline granite with minor outcrops of basalt. The peralkaline, within- plate and A-type nature of granite are evident by its chemical characteristics. The granite is characterized by high Na 2 O+K 2 O, Fe/Mg, Zr, Nb, Y, Zn; low Al 2 O 3 , CaO and Sr and is significantly low in absolute abundance of trace and REE elements compared to type area Siwana granite. The granite is correlated to the “Pan-African” event and its petrogenesis and tectonic significance are discussed.

Natural and anthropic processes controlling groundwater hydrogeochemistry in a tourist destination in northeastern Brazil

The objective of this study was to analyze spatial-seasonal changes to identify the natural and anthropic processes that control groundwater hydrogeochemistry in urban aquifers in municipality of Lençóis (Bahia). Tourism is the main activity of this municipality, which is an important tourist destination in northeastern Brazil and which maintains its tourism infrastructure by using groundwater. Two field campaigns were conducted (dry and rainy seasons) in order to collect groundwater samples extracted from 15 tubular wells distributed over the urban area of the municipality. The Piper diagram, multivariate statistical analyses, and artificial neural networks indicated that there are two types of water (Na–Cl and Na–SO42

Isolation and Selection of Fungi for Degrading Saturated Hydrocarbons, Aromatic Hydrocarbons and NSO Compounds

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Bioremediation in Mangrove Sediments Impacted by Oil Using Two Types of Fertilizers NPK and OSMOCOTE, Brazil

−), which were divided into five different clusters. Seasonal variation was observed to significantly alter groundwater hydrogeochemistry. According to the Gibbs diagram, groundwater within the urban area of Lençóis belonged to the rainfall dominance, demonstrating low water-rock interaction. Hydrogeochemical modeling results suggested hydrolysis as the main natural factors controlling process. However, mineral dissolution also occurred in one of the clusters. Human-originated trace contamination by nitrate, chloride, and sulfate occurred in a zone of the urban area. This contamination was observed regardless of climate seasonality, indicating that the main controlling process for groundwater hydrochemistry in this region is wastewater mobilization (indirect artificial recharge).