Dongguan observation standard settlement observation point settlement observation nail shipped nationwide

Description :

　　In the process of observing geological phenomena in the field, it is necessary to adhere to a scientific attitude of seeking truth from facts and comprehensively collect first-hand information. In work, achieve the "five diligence" (diligent pursuit, diligent knocking, diligent inspection, diligent testing, and diligent recording), and avoid subjective choices in recording content. Strengthen observation and research between points, and grasp the changes of various geological phenomena between points. Be good at using geological thinking methods to timely discover and solve problems, and improve the foresight and initiative of observation route (point) investigation and research.

　　（2） Observation point observation description

　　In field work, it is necessary to carefully record and describe various geological phenomena and mineral conditions observed in the form of text or sketches in a field record book or digital photographs. The field record book is an extremely important source of data, and the content recorded should generally cover all geological phenomena observed. Important or observed geological phenomena should be described in detail, while general phenomena or previously described content on this route can be simplified. Emphasis should be placed on recording the special characteristics or changes that occur, achieving accurate textual expression, highlighting key points, and clarifying priorities. At the same time, field records can also appropriately record the analysis, judgment, reasoning, and comprehensive induction of objective geological phenomena by observers. At the end of each route, a route summary must be written.

　　The field record book is not allowed to be altered arbitrarily. If the recorded content is inappropriate, the original content can only be crossed out and annotated next to it. Records must be written with a 2H-3H pencil, and the writing should be neat and clear. Ballpoint pens or fountain pens are not allowed to be used for recording.

　　The characteristics of observation points include boundary points, structural points, lithological points, mineral points, geomorphological points, Quaternary geological points, and hydrogeological points. The description of different observation points has its own emphasis, which is now introduced as follows:

　　1. Geological boundary points

　　Geological boundary points include formal mapping units, group boundaries, non rock stratigraphic unit boundaries, unconformity boundaries, intrusion contact boundaries, metamorphic zone boundaries, etc. The record description of geological boundary points should include the lithological characteristics, occurrence elements, structural features such as folds and faults on both sides; The type and basis of non integration boundaries should be recorded and described; Describe the basis for the contact relationship between invading bodies, including invasion contact, sedimentary contact, fault contact, as well as the characteristics of intrusive rock attitude, invasion period, internal and external contact metamorphism and metasomatism alteration, lithofacies zone, etc; Record and describe the boundaries of metamorphic rocks, including their types, compositions, residual structures, metamorphic facies, ductile deformation, and various foliation structures.

　　2. Construction points

　　It includes structural features such as folds, faults, joints, planes, and lineations, and its recorded description includes the following:

　　(1) Indirect markers on the terrain;

　　(2) Direct marking;

　　(3) Provide a detailed description of various types, forms, attitudes, scales, and combinations of geological structures, analyze their formation sequence, age, as well as geological structures and sedimentary processes, magmatic activity, metamorphic processes, and mineralization processes.

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