Diagenesis of the Maxon Sandstone (Early Cretaceous), Marathon region, Texas; a diagenetic quartzarenite
Diagenesis of the Maxon Sandstone (Early Cretaceous), Marathon region, Texas; a diagenetic quartzarenite
复制标题
德克萨斯州马拉松地区 Maxon 砂岩（早白垩世）的成岩作用；
DOI：
10.1306/212f8ab7-2b24-11d7-8648000102c1865d
复制
发表时间：
1987
影响因子：
2
通讯作者：
E. McBride
中科院分区：
文献类型：
--
作者：
E. McBride
沉积环境、气候、碎屑矿物组成和在厚层碳酸盐岩序列中的地层位置是Maxon砂岩成岩作用的主要控制因素。河流-三角洲砂体在被埋藏之前，经历了钙化作用和其他成土过程，失去了所有的大孔隙度。大多数砂进行压实（平均14%的孔隙度损失），轻微的胶结石英和高岭石，可能在入侵期间引入的大气降水在海平面低的立场，其次是广泛的胶结和方解石颗粒置换。方解石的碳、氧同位素值表明碳酸盐是由邻近灰岩的地层沃茨引入的。在成岩作用过程中的化学成分的损失和增益的质量平衡计算表明，有一个主要的损失二氧化硅（从损失的菱镁矿）和主要收益的CaO和CO2（在方解石水泥）。方解石胶结物在碎屑石英颗粒上的重叠在薄片上给人的印象是石英被方解石广泛取代。然而，在HCl中浸出的样品的薄片和SEM视图显示，即使是部分取代的石英是罕见的，并且主要限于微小的石英过度生长的边缘。忽略层内碎屑，大多数Maxon砂岩现在是石英砂岩（Q86 F1 R3）。然而，由于长石颗粒被方解石所取代，砂最初是次长石（Q86 F10 R3）。
ABSTRACT Environments of deposition, climate, detrital mineral composition, and stratigraphic position within a thick sequence of carbonate rocks were major controls on the diagenesis of Maxon sandstones. Fluvial-deltaic sands, which were subjected to calichification and other pedogenic processes, lost all macroporosity prior to burial. Most sands underwent compaction (average of 14% porosity loss), minor cementation by quartz and kaolinite, possibly during invasion of meteoric water introduced during a low stand of sea level, followed by extensive cementation and grain replacement by calcite. C and O isotopic values of calcite suggest that carbonate was introduced by formation waters derived from adjacent limestones. Mass-balance calculations on the loss and gain of chemical components during diagenesis show there was a major loss of silica (from loss of feldspars) and major gains in CaO and CO2 (in calcite cement). The overlap of calcite cement on detrital quartz grains gives the impression in thin section that the replacement of quartz by calcite was extensive. However, thin-section and SEM views of samples leached in HC1 show that even partial replacement of quartz is rare and is limited largely to the edges of tiny quartz overgrowths. Ignoring intraformational clasts, most Maxon sandstones now are quartzarenites (Q86F1R3). However, compensating conservatively for feldspar grains replaced by calcite, sands originally were subarkoses (Q86F10R3).