Characterization of Stratified Iron-Oxide-Apatite Ores

[9814761]纳斯伦在世界许多地方，磁铁矿、磷灰石和赤铁矿是重要的铁矿石。此外，这些矿床中的许多都与Cu、Au、Ag、U和稀土元素的经济富集有关。这些矿床中的大多数似乎是由极端成分的富含铁和磷的液体（岩浆或流体）形成的，这些液体要么侵入深处，要么喷发到地表，要么通过热液取代宿主岩石。这些矿床中许多含有横向扩展的、层状的、氧化铁和磷灰石丰富的单元。这些层状的氧化铁-磷灰石矿石在各个地方的形成机制似乎并不相同。该项目的目的是检查来自不同地区的分层氧化铁-磷灰石矿石的现场关系、结构特征和组成，以确定哪些特征可以最好地用于区分已提出的各种起源机制。实地研究将对来自智利班德拉山脉的分层氧化铁磷灰石矿石进行取样和绘制详细地图。智利El Laco层状氧化铁磷灰石矿石样品；瑞典基律纳;密苏里州Pilot Knob；和宾夕法尼亚州的康沃尔已经被收集了。实验研究将检验氧化铁液体和流体在一系列温度、压力和挥发性成分下的稳定性。这个项目将是纽约州立大学宾汉姆顿分校、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.