Transition from contractional to transpressive tectonics: evidence from the Feira Nova Region, Rio Capibaribe Domain, Borborema Province, NE Brazil

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Brazilian Journal of Geology Pub Date : 2021-01-01 DOI:10.1590/2317-4889202120200049
V. L. Silva, S. Neves
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引用次数: 5

Abstract

Differences in tectonic style and kinematics in orogenic belts can result from either multiphase or progressive deformation. In eastern Borborema Province, a regional shallow dipping foliation is multiply folded and crosscut by transcurrent shear zones. Here, we investigate if these fabrics resulted from diachronous deformational events or from a single-phase progressive deformation. The study area, the Feira Nova region, mostly comprises metasedimentary rocks from the Surubim Complex, and is bounded by the NE-trending sinistral Gloria do Goitá (GGSZ) and the sinistral contractional Paudalho (PSZ) shear zones, which separate it from Paleoproterozoic basement rocks. Structures can be grouped into a contractional and a transpressional stage, both related to the Brasiliano Orogeny. The contraction-related structures are represented by a gently dipping foliation (S2) related to a top-to-the-NW tectonic transport. The contact between the metasedimentary and basement rocks is parallel to S2, indicating the fabrics in both lithotypes are of Brasiliano age, with strain localization having produced the PSZ. NW-verging macroscopic folds are consistent with this regime. The following transpression generated steep mylonitic foliation (S3) mainly along the GGSZ, and caused refolding. The data here presented are consistent with a progressive deformation history comprising a gradual transition from contraction to transpression.
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从收缩构造到压迫构造的转变:来自巴西东北部borborrema省Rio Capibaribe地区Feira Nova地区的证据
造山带的构造样式和运动差异可能是多相变形或渐进变形的结果。在borborrema省东部,一个区域性的浅倾斜叶理被横向剪切带多次折叠和横切。在这里,我们研究这些织物是由历时变形事件还是由单相渐进变形造成的。研究区主要由苏鲁比姆杂岩中的变质沉积岩组成,以北东向左旋格洛里亚-戈伊特 (GGSZ)和左旋收缩性Paudalho (PSZ)剪切带为界,与古元古代基底岩隔离开。构造可分为收缩期和挤压期,均与巴西利亚造山运动有关。与收缩有关的构造以缓倾斜的叶理作用(S2)为代表,与顶部到nw的构造搬运有关。变质沉积岩与基底岩的接触平行于S2,表明两种岩型的组构均为Brasiliano时代,应变局部化产生了PSZ。北西向北的宏观褶皱与这一规律一致。随后的转位作用主要沿GGSZ产生陡糜棱质叶理(S3),并引起再褶皱。这里提供的资料与一个渐进的变形历史相一致,包括从收缩到伸展的逐渐过渡。
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来源期刊
Brazilian Journal of Geology
Brazilian Journal of Geology GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.20
自引率
7.10%
发文量
12
审稿时长
11 weeks
期刊介绍: The Brazilian Journal of Geology (BJG) is a quarterly journal published by the Brazilian Geological Society with an electronic open access version that provides an in-ternacional medium for the publication of original scientific work of broad interest concerned with all aspects of the earth sciences in Brazil, South America, and Antarctica, in-cluding oceanic regions adjacent to these regions. The BJG publishes papers with a regional appeal and more than local significance in the fields of mineralogy, petrology, geochemistry, paleontology, sedimentology, stratigraphy, structural geology, tectonics, neotectonics, geophysics applied to geology, volcanology, metallogeny and mineral deposits, marine geology, glaciology, paleoclimatology, geochronology, biostratigraphy, engineering geology, hydrogeology, geological hazards and remote sensing, providing a niche for interdisciplinary work on regional geology and Earth history. The BJG publishes articles (including review articles), rapid communications, articles with accelerated review processes, editorials, and discussions (brief, objective and concise comments on recent papers published in BJG with replies by authors). Manuscripts must be written in English. Companion papers will not be accepted.
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