Abstract

The article presents data on numerous findings of authigenic K-feldspars in the Lower–Upper Carboniferous carbonate and terrigenous rocks in the southern limb of the Moscow syneclise, including the Oka–Tsna bar. In terms of the composition and crystalline structure, all feldspar morphotypes (idiomorphic monocrystalline fringes on the surface of sandy clastic grains, fine-crystalline aggregates, pseudomorphously replacing organogenic carbonate detritus, and pseudoskeletal crystals) are composed of K-sanidine with the overwhelming predominance of K over Na and extremely low concentrations of Ca, Ba, and Sr. As can be seen from ⁴⁰Ar/³⁹Ar dating, the authigenic sanidine mineralization took place during the Permian, i.e., 20–55 Ma later than the accumulation of host Carboniferous rocks. Mineralogical observations, as well as paleofacies and paleogeographic reconstructions, suggest that the formation of authigenic K-feldspars is associated with the gravitation-brine catagenesis in the southern limb of the Moscow syneclise as a result of the seepage of high-mineralization brines from Permian evaporate marine basins into the underlying older rocks.

中文翻译：

---

自生的山idine碱作为重力的盐矿矿物指标在莫斯科Syneclise的南部石炭纪岩石中的重力诱变。

摘要

这篇文章提供了有关在莫斯科同盟南下缘的上，下石炭统碳酸盐岩和陆源岩中自生钾长石的众多发现的数据，包括Oka-Tsna条。就组成和晶体结构而言，所有的长石形态（沙质碎屑表面上的独特形态的单晶条纹，细晶聚集体，假晶取代的有机碳酸盐碎屑和假骨骼的晶体）均由K-山梨酸组成，其主要成分为从⁴⁰ Ar / ³⁹可以看出，Na上的K和钙，Ba和Sr的浓度极低。Ar测年，自成因的Sanidine矿化发生在二叠纪，即晚于宿主石炭纪岩石的堆积20-55 Ma。矿物学观察以及古相和古地理重建表明，由于二叠纪蒸发物中高矿化盐水的渗入，自生钾长石的形成与莫斯科合众国南部的重力-盐水催化作用有关。海洋盆地进入下层较老的岩石中。