China Geological Survey: 1: 50 000 geological map database of the Delehada map-sheet (K47E013003), Gansu Province

The 1: 50 000 geological map database of the Delehada map-sheet (K47E013003), Gansu Province was initiated with a thorough compilation of existing data, driven by specific needs and aimed at resolving critical geological issues through regional geological surveys. Survey routes were meticulously designed to emphasize vertical traverses across tectonic lines, supplemented by tracing routes, avoiding a uniform distribution of efforts or route density. The focus was on leveraging remote sensing imagery from diverse sources. Geological entities were defined using rock assemblages as mapping units, enabling a detailed depiction of geological bodies. This comprehensive work encompassed a total of 683 geological bodies, categorized into 19 sedimentary, 1 volcanic, 10 intrusive, and 20 metamorphic rock units. The database, which is approximately 73.2 MB in size, includes an in-depth study of previously identified Precambrian geological bodies. This involved the dissection of numerous intrusive bodies with minimal deformation and metamorphism, resulting in the discovery of Neoproterozoic gneissic granite and a substantial amount of early Paleozoic arc-related magmatic rocks. The precise portrayal of rock assemblages and the metamorphic deformation characteristics of metamorphic crustal rocks allowed for the constraining of their formation ages. A logical division of the spatiotemporal evolution sequence of magmatic rocks in the surveyed area was established. The geological map was compiled following the guidelines for tectonic and lithological entity mapping, achieving a harmonious balance between factual representation and interpretive comprehension. The establishment of this database offers significant field geological evidence, which is crucial for discussions on the characteristics of the Mingshui Block in the northern segment of the Beishan Orogenic Belt and for the delineation of tectonic units.

甘肃省德勒哈达幅（K47E013003）1:5万地质图数据库以具体需求为牵引，通过全面整合已有资料启动建设，旨在通过区域地质调查解决关键地质问题。野外踏勘路线经精心设计，重点布置垂直于构造线的横穿剖面，辅以追索路线，避免工作量与路线密度的均一化分布。本次研究重点依托多源遥感影像开展工作，以岩石组合作为填图单位厘定地质实体，实现了对地质体的精细化刻画。本次综合工作共厘定683个地质体，划分为19个沉积岩单元、1个火山岩单元、10个侵入岩单元及20个变质岩单元。本数据库体量约73.2 MB，包含对已识别前寒武纪（Precambrian）地质体的深入研究：研究对变形与变质程度较弱的众多侵入体进行了精细解剖，发现了新元古代（Neoproterozoic）片麻状花岗岩以及大量早古生代（early Paleozoic）弧相关岩浆岩；通过精准刻画岩石组合与变质地壳岩石的变形变质特征，限定了其形成时代，并建立了研究区岩浆岩时空演化序列的合理划分方案。本次地质图编制遵循构造与岩性实体填图规范，实现了事实性表述与解释性认知的有机统一。本数据库的建成提供了重要的野外地质证据，对于讨论北山造山带北段明水地块的特征以及构造单元划分具有关键意义。