Researches on hydrothermal alteration zones by means of rock magnetism and opaque mineralogy.

利用岩石磁学和不透明矿物学研究热液蚀变带。

基本信息

批准号：
63460051
负责人：
UENO Hirotomo
金额：
$ 5.5万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

1. There exist hydrothermal alteration zones around any type of ore deposits. The main purpose of this research is the new trial of investigation on hydrothermal alteration zones by means of rock magnetism and opaque mineralogy.2. Continuous sections from fresh to altered within the dame igneous rock body are selected for this study. (1) Volcanic sulfur deposits; Advancing alteration, original titanomagnetite as a rock forming mineral changes partly maghemite. As kaolinite and montmorillonite are detected in more altered sites, Ti rich hematite is formed from maghemite and tita nomagnetite. In highly altered sites opaque minerals consist of Ti poor hematite and pseudobrookite. Finally these opaque minerals change to marcasite. It is confirmed that the chemical remanent magnetization due to hematite are acquired in hydrothermal alteration zones. (2) Kuroko deposits; Magnetite changes to hematite, and the final opaque mineral is pyrite. The chemical remanent magnetization is also recognized in altered sites. (3) Pyrometasomatic deposits; Tile fresh parts of tile quartz diorite bodies have magnetite of 150 microns or less in size. As the alteration increases in grade, magnetite ought to be recrystallized as the aggregate of small magnetite of 10 microns in each grain size. The recrystallized magnetite contains less V203, A1203 and TiO2, and high Curie temperatures. Finally those change to pyrite.3. Outputs of the spinner magnetometer SSM-2A were connected to NEC PC-9801 VM11 through RS232C with PC-FORTRAN. Consequently, magnetic measurements become speedy and more accurate.

1、任何类型的矿床周围都存在热液蚀变带。本研究的主要目的是利用岩石磁性和不透明矿物学手段研究热液蚀变带的新尝试。 2．本研究选择了 dame 火成岩体内从新鲜到蚀变的连续剖面。 (1)火山硫矿床；随着蚀变的进行，作为造岩矿物的原始钛磁铁矿部分转变为磁赤铁矿。由于高岭石和蒙脱石在更多的蚀变位点中检测到，富钛赤铁矿是由磁赤铁矿和钛常磁铁矿形成的。在高度蚀变的地点，不透明矿物由贫钛赤铁矿和铁板钛矿组成。最后这些不透明矿物变成白铁矿。经证实，赤铁矿产生的化学剩磁是在热液蚀变带中获得的。 (2)黑子存款；磁铁矿变成赤铁矿，最终的不透明矿物是黄铁矿。在改变的位置也可以识别出化学剩磁。 (3) 火交体矿床；瓦片石英闪长岩体的瓦片新鲜部分含有尺寸为 150 微米或更小的磁铁矿。随着蚀变品位的增加，磁铁矿应再结晶为每个晶粒尺寸为10微米的小磁铁矿的集合体。再结晶磁铁矿含有较少的V2O3、A12O3和TiO2，居里温度较高。最后那些变成了黄铁矿。3。旋转磁力计 SSM-2A 的输出通过 PC-FORTRAN 通过 RS232C 连接到 NEC PC-9801 VM11。因此，磁性测量变得快速且更加准确。