Field investigations and lava flow mapping around Khandwa (21°49′ N:76°21′ E), Central India (within the eastern Deccan volcanic province) record three distinct lava flows which are in general, characterized by several structural zones, for example, Lower Vesicular Zone, Lower Colonnade Zone, Entablature Zone (EZ), Upper Colonnade Zone (UCZ), and Upper Vesicular Zone (UVZ). Different lava flows (often with chilled zones) in the field have been marked by discontinuous thin intertrappean beds. The occasional presence of chilled dyke and feeder dyke (both associated with Flow II) has also been noticed. The entire lava succession rests over coarse-grained (cumulate) gabbroic (apparent) basement. Deduced clinopyroxene ordering clearly indicates that 100% initial ordering had been achieved for Flow II chilled zone, Flow II UCZ, Flow III UCZ, Flow III EZ, and cumulate gabbro. On the contrary, Flow II UCZ (97.35% initial ordering), feeder dyke (98.76% initial ordering), chilled dyke (99.82% initial ordering), and Flow I chilled zone (99.07% initial ordering) show initial clinopyroxene disordering (<100% ordering), which were later subjected to a gradual process to achieve ordering. Second-order regression analyses clearly indicate that the progressive clinopyroxene ordering-process is controlled by several differentiation parameters namely An% of coexisting plagioclase, lower thermometric values, and FeO^t/MgO. In addition, roles of Al^VI, Ti⁴⁺, and Fe³ were also suggested to influence the clinopyroxene ordering-style. Based on Ti/6ox versus Al/6ox relation of clinopyroxene, it was deduced that cooling rate appreciably controls the clinopyroxene ordering-behaviour. We contemplate that variation in clinopyroxene ordering-pattern in basaltic rocks of Khandwa represents interplay of differentiation parameters and cooling rate of the ambient magma.

中文翻译：

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印度中部德干火山省东部康德瓦地区玄武岩组单斜辉石晶格中铁镁替代的岩石成因意义

印度中部（德干东部火山省内）Khandwa（21°49' N:76°21' E）周围的实地调查和熔岩流测绘记录了三个不同的熔岩流，这些熔岩流通常具有几个结构带，例如、下水泡区、下柱廊区、柱廊区 (EZ)、上柱廊区 (UCZ) 和上水泡区 (UVZ)。现场不同的熔岩流（通常带有冷却区）以不连续的薄层间层为特征。还注意到偶尔存在冷冻堤坝和馈线堤坝（均与 Flow II 相关）。整个熔岩序列位于粗粒（累积）辉长岩（明显）基底上。推导出的单斜辉石排序清楚地表明，对于 Flow II 冷却区、Flow II UCZ、Flow III UCZ、Flow III EZ，已经实现了 100% 的初始排序，并累积辉长岩。相反，Flow II UCZ（97.35% 初始排序）、馈线堤坝（98.76% 初始排序）、冷冻堤坝（99.82% 初始排序）和 Flow I 冷冻区（99.07% 初始排序）显示初始单辉石无序（<100 % ordering），后来经过一个渐进的过程来实现排序。二阶回归分析清楚地表明，渐进式单斜辉石有序过程受几个微分参数控制，即共存斜长石的 An%、较低的温度值和 FeO 后来经过一个渐进的过程来实现排序。二阶回归分析清楚地表明，渐进式单斜辉石有序过程受几个微分参数控制，即共存斜长石的 An%、较低的温度值和 FeO 后来经过一个渐进的过程来实现排序。二阶回归分析清楚地表明，渐进式单斜辉石有序过程受几个微分参数控制，即共存斜长石的 An%、较低的温度值和 FeO^t /MgO。此外，Al ^VI、Ti ⁴⁺和Fe ³的作用也被认为影响单斜辉石的有序型。基于单斜辉石的 Ti/6ox 与 Al/6ox 的关系，推断冷却速率明显控制了单斜辉石的有序行为。我们认为 Khandwa 玄武岩中单斜辉石排序模式的变化代表了分异参数和周围岩浆冷却速率的相互作用。