Table 1 Classification of dolostones from the Ediacaran to ordovician strata of the Tarim basin.

From: Using Mg isotopes to constrain the formation temperature of dolomite

Types

Formation

Crystal size

Crystal morphology

D1

Qigebulake

10–50 μm

Planar anhedral crystals or planar subhedral crystals

D2

Xiaoerbulake

50–250 μm

Planar euhedral crystals or planar subhedral crystals

D3

Penglaiba/Yingshan

250–500 μm

Non-planar subhedral crystals or non-planar anhedral crystals

  1. D1: micro-fine crystalline dolostone; D2: fine-medium crystalline dolostone; D3: medium-coarse crystalline dolostone. Planar refers to the crystal’s surface being relatively flat and smooth, with well-formed crystal faces. Non-planar refers to crystals whose surfaces are not flat, meaning the crystal faces exhibit curvature, undulation, or irregular features. Euhedral refers to a crystal that has well-formed, symmetrical, and distinct faces that clearly represent the internal crystal structure. Subhedral describes crystals that have some well-developed faces but still lack complete symmetry or perfect geometric form. Anhedral refers to a crystal that lacks well-formed or distinct crystal faces.
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