Copper and gold in skarn at Brown's Creek, Blayney, N.S.W.
Copper and gold in skarn at Brown's Creek, Blayney, N.S.W.
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DOI：
10.1080/00167618308729268
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发表时间：
1983-12
期刊：
影响因子：
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通讯作者：
G. Taylor
中科院分区：
文献类型：
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作者：
G. Taylor
布朗溪，布莱尼，N.S.W.，产于安古隆凝灰岩内Carcoar花岗岩和奥陶纪石灰岩接触处的钙硅酸盐夕卡岩中。在灰岩与几个互层凝灰质泥岩单元的接触处形成了层控矽卡岩。石灰岩中的脉状矽卡岩源自几个近垂直裂缝，可能源自下面的层控矽卡岩。在钙硅酸盐矽卡岩中，几种离散的矿物组合代表了碳酸盐置换程度的增加。层控夕卡岩由石英、方解石和伊多晶岩的细粒带与绿帘石和硫化物带交替组成，表明扩散过程是有效的。粗粒层控夕卡岩由硅灰石、石榴石、透辉石、硫化物（磁黄铁矿、黄铜矿、毒砂、砷黝铜矿）和金组成。脉矽卡岩也由硅灰石、石榴子石和透辉石组成，但伴随着硅灰石、黄铜矿和硅质岩。
Abstract Mineralisation at Brown's Creek, Blayney, N.S.W., occurs in calcsilicate skarns at the contact between the Carcoar Granite and Ordovician limestones within the Angullong Tuff. Stratabound skarns have formed at the contact between limestone and several interbedded tuffaceous mudstone units. Vein‐skarns in the limestone emanate from several sub‐vertical fractures, and are possibly derived from underlying stratabound skarn. Within the calcsilicate skarns, several discrete mineral assemblages represent increasing degrees of carbonate replacement. Stratabound skarns, consisting of fine‐grained bands of quartz, calcite and idocrase alternating with bands of epi‐dote and sulphides, indicate a period during which diffusion processes were effective. Coarse‐grained stratabound skarn is comprised of wollastonite, garnet, diopside, sulphides (pyrrhotite, chalcopyrite, arsenopyrite, tennantite) and gold. Vein‐skarns are also composed of wollastonite, garnet and diopside, but are accompanied by bornite, chalco...