Characterization of Stratified Iron-Oxide-Apatite Ores

磁铁矿、磷灰石和赤铁矿的矿床是世界上许多地方重要的铁矿石。 此外，这些矿床中有许多与Cu、Au、Ag、U和稀土元素的经济富集有关。 大多数这些矿床似乎是由富含铁和磷的液体（岩浆或流体）形成的，这些液体的成分极端，要么侵入深部，喷发到地表，要么热液取代了寄主岩石。 这些矿床中有许多含有横向延伸的、层状的、富含氧化铁和磷灰石的单元。 这些层状氧化铁-磷灰石矿石似乎并非在所有地方都是由相同的机制形成的。 本项目的目的是研究来自不同地区的层状氧化铁-磷灰石矿石的场关系、结构特征和成分，以确定哪些特征最能用于区分已提出的各种成因机制。 实地研究将对智利Sierra Bandera的层状氧化铁-磷灰石矿石进行取样和详细绘图。 已经在智利的埃尔拉科、瑞典的基律纳、密苏里州的Pilot Knob和宾夕法尼亚州的康沃尔采集了层状氧化铁-磷灰石矿石样品。 实验研究将检查氧化铁液体和流体在一定温度、压力和挥发性成分范围内的稳定性。 这一项目将是位于宾厄姆顿的纽约州立大学、智利圣地亚哥大学和瑞典自然历史博物馆之间的合作研究。

9814761NaslundDeposits of magnetite, apatite, and hematite are important ores of iron in many parts of the world. In addition, many of these deposits are associated with economic concentrations of Cu, Au, Ag, U, and rare earth elements. Most of these deposits appear to have formed from iron- and phosphorous-rich liquids (magmas or fluids) of extreme compositions which have either intruded at depth, erupted onto the surface, or hydrothermally replaced host rocks. Many of these deposits contain laterally-extensive, stratified, iron oxide- and apatite-rich units. These stratified iron oxide-apatite ores do not appear to have formed by the same mechanism in all localities. The purpose of this project is to examine the field relationships, textural characteristics, and compositions of stratified iron oxide-apatite ores from a variety of localities, to determine what characteristics can best be used to discriminate between the various mechanisms that have been proposed for their origin. Field studies will sample and map in detail stratified iron oxide-apatite ores from Sierra Bandera, Chile. Samples from stratified iron oxide-apatite ores at El Laco, Chile; Kiruna, Sweden; Pilot Knob, Missouri; and Cornwall, Pennsylvania have already been collected. Experimental studies will examine the stability of iron-oxide liquids and fluids over a range of temperatures, pressures, and volatile compositions. This project will be a cooperative study between the State University of New York at Binghamton, the Universidad de Santiago, Chile, and the Swedish Museum of Natural History.