We report here chemical analyses of sulfide and other minerals occurring in the massive sulfide deposit cored at Site 471. Details of the mineralogy and inferred paragenesis of the deposit will be reported elsewhere. The sulfide deposit at Site 471 occurs between overlying pelagic sediment and underlying basalt. The deposit is vertically zoned and consists, from top to bottom, of the following mineral assemblages: (1) pyrite, chalcopyrite, and Zn-sulfide in chert and calcite gangue (about 35 cm thick); (2) a 5-cm-thick metalliferous sediment layer described in detail by Leinen (this volume); and (3) a 4-cm-thick chert layer. The overlying sediment is a calcareous silty claystone that contains middle Miocene coccoliths (Bukry, this volume). The underlying basalt has been extensively chloritized and veined with calcite. In places feldspars are albitized, and calcite occurs as pseudomorphs after olivine. Relict textures suggest that the basalt grades into diabase and gabbro with increasing depth. Neither stock work nor disseminated sulfides was observed in the altered rocks.

Values are means and SD. Means followed by the same lowercase letters in a column are not different among the month of litter collection.Carbon, SiO2, phytolith and PhytOC concentrations (or stocks), and PhytOC fluxes through litter fall in a Lei bamboo stand in different months.

ABSTRACT: The Glória Sul Stock (SGS) (41 km2) is a round-shaped pluton, which intrudes the metasediments of the central area of the Macururé Domain, in the Sergipano Orogenic System (SOS). The stock encompasses a number of leucocratic syenogranites, including biotite syenogranite, muscovite-biotite bearing syenogranite and muscovite syenogranite. Mafic microgranular enclaves with syenitic composition are abundant in the biotite syenogranites but very rare in the muscovite-biotite bearing syenogranites. The syenogranites are predominantly metaluminous although the more evolved rocks show a peraluminous character. They can be classified as I-type and high-K calc-alkaline rocks. The syenitic enclaves are metaluminous and show shoshonitic geochemical characteristics. Geochemical modeling suggests that petrological diversity may be explained by considering mixing between peraluminous magma with ca. 73% SiO2 and a mafic shoshonitic magma with ca. 56% SiO2. Trace elements contents (Ba = 1,179 - 319 ppm; Rb = 351 - 55.3 ppm; Y = 16.7 - 1.6 ppm) are higher in the enclaves than in the granites. REE contents range from 38.58 - 299.21 ppm; LaN/YbN = 12.57 - 137.22 and Eu/Eu* = 0.72 - 1.94. The present data indicates that granitogenesis in the Macururé Domain (DM) is complex as well as that the widespread leucocratic syenogranites are post-tectonic, having been generated through interaction between peraluminous rhyolitic magmas and mantellic shoshonitic magmas.