Petrography and genesis of a wollastonite body and its associated rocks at Holyoake Valley, Nelson, New Zealand
Petrography and genesis of a wollastonite body and its associated rocks at Holyoake Valley, Nelson, New Zealand
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新西兰尼尔森霍利奥克谷硅灰石体及其伴生岩石的岩相学和成因
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发表时间：
1995
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通讯作者：
W. Watters
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作者：
W. Watters
摘要：来自霍利奥克山谷迦南花岗闪长岩接触光环内富含硅灰石透镜体的样品，长至 55 m，宽达 10 m，其中包括多种钙硅酸盐岩石，其中局部含有丰富的钛矿。接触岩的矿物学表明变质作用期间存在角闪石-角岩相条件。在硅灰石体内，有一条直径达 2 m 的二长岩成分的侵入脉，可能是由于部分脱硅和邻近富钙岩石污染而改变的花岗闪长质岩浆的结晶作用。还存在分区的钙硅酸盐岩石，显然是由硅灰石和基性角岩之间的反应形成的，而基性角岩是通过可能玄武岩成分的岩脉的重结晶产生的。少量石英长石岩浆的晚期侵入发生在硅灰石体内部和附近的不连续处，包括岩脉边界。铁和钛的交代作用可能与侵入有关...
Abstract Samples from a wollastonite‐rich lens, up to 55 m long and 10 m wide, within the contact aureole of the Canaan Granodiorite at Holyoake Valley, include a variety of calc‐silicate rocks which locally contain abundant titanite. The mineralogy of the contact rocks indicates hornblende ‐hornfels facies conditions during metamorphism. Within the wollastonite body, an intrusive vein of monzonitic composition, up to 2 m across, probably resulted from crystallisation of granodioritic magma modified by partial desilication and contamination from adjacent calcium‐rich rocks. Zoned calc‐silicate rocks, apparently formed by reaction between wollastonite and basic hornfels that had been produced by recrystallisation of a dike of probable basaltic composition, are also present. Late intrusion of small amounts of quartzofeldspathic magma took place along discontinuities, including the dike boundaries, within and adjacent to the wollastonite body. Iron and titanium metasomatism was probably associated with intru...