History Woyla Arc of the Garba Complex: Implications for Tectonic Evolution of the South Sumatra Region, Indonesia

Studies on outcrop-scale structures have been conducted at the Garba complex. This study aims to add the high-resolution of the South Sumatra region to reconstruct the structural geology and implications of tectonics for the region. The study area is commonly referred to as crystalline basement highs forming the southwestern boundary of the Paleogene South Sumatra basin. The structures commonly show the NW-SE, NNW-SSE, and ENE-WSW trends. The methodology used includes field mapping, analysis of Digital Elevation Model (DEM), petrography, and X-ray fluorescence (XRF). The major fractures include wrench slip, reverse, and normal faults, while the ob-servable microstructures comprise pull-apart calcite veins, shear joints, bou-dins, parasitic folds, and the augens. The earlier structuring episode was probably related to crustal extension, perhaps associated with the Paleogene rifting that occurred along the western margin of Sundaland. In the Late Neogene, tectonic compression took place in the entire region, allowing inversion of the Pre-Tertiary sequence. As compression waned in the Pleistocene, extension commenced, and a number of the ENE- WSW tensional block faulting developed and intersected the older NNW-SSE alignments. It is important to note that the latest tectonic event in conjunction with deep erosional denudation had likely exhumed the terrain and eventually shaped the present-day fractured and rough landforms in the study area.

The strongly similar lithologies beneath the South Sumatra back-arc basin with the outcropping rock units within the Garba block confirm that the two regions are essentially a single entity (Adiwidjaja & de Coster, 1973;de Coster, 1974); and likely have interrelated deformation history. The terrain has also been interpreted as the southwestern extension of the basinal basement unit (Barber et al., 2005). Hence, it is important to note that studies on structural configuration recorded in the outcrop-scale exposures may provide a powerful tool for better understanding the deformation styles within the unexposed basement sequence of the back-arc setting, which has long been recognized as an oil-gas producing depocenter. Such a study may become fundamental, especially in exploring a deeper reservoir within the basinal section (Guttormsen, 2010;Budiman et al., 2011;Sunarjanto & Widjaja, 2013;Risyad et al., 2017). In a regional context, the Garba complex has been interpreted based on a wide range of perspectives. (Pulonggono et al., 1992) considered that the terrain was uplifted due principally to extension taking place in Paleogene time. (Barber et al., 2005) stated that the area was a site of collision complex between Sibumasu and Indochina block. (Hall, 2014) suggested that Woyla volcanic arc, including the present Garba complex, resulted from subduction between Mesotethys and Cenotethys. This study will be illustrated in modeling the magma series on the Woyla arc based on petrographic and geochemical data of rocks using the XRF method. The more recent work reported that there was renewed subduction during the post-converging episode between the Woyla volcanic arc and Sundaland in the island of Sumatra, in which the event resulted in Situlanglang ridge and Insu mélange complex (Advokaat et al., 2018). The recently conducted work was to identify the geological structures recorded within the rock sequence, which may explain tectonic episodes responsible for the exposure of the Garba block. Thus, this study aimed principally to reconstruct the structural architecture and the tectonic evolution of the terrain in Tertiary time. The microstructure analysis and the evolutionary geochemical data in Garba complex tectonic studies are very helpful for future research.

Materials and Methods
This study employed two practical approaches: lineament mapping and ground investigation to recognize strain distributions throughout the crystalline rock Idarwati et al. Journal of Geoscience and Environment Protection exposures at the Garba complex. Data collection methods and field sampling methods are the keys in reconstructing the tectonic evolution model in this study which is supported by DEM analysis, petrography, and igneous rock geochemistry in the form of XRF. Delineation of major alignments was interpreted using the Digital Elevation Model (DEM) as suggested by several workers (Abe et al., 2011;Chenrai, 2012;Khajavi et al., 2014;Meixner et al., 2018). The present study employed the DEM was available in Seamless National DEM or DEMNas at tides.big.go.id provided by the Indonesian Geospatial Agency. The system provided three data sources with different resolutions, such as IFSAR (5 m), TERRASAR-X (5 m), and ALOS PALSAR (11.25 m) with additional mass-point of vertical datum EGM2008. Meanwhile, to improve the DEM resolution up to 0.27 arc second (8.1 m), this work has compiled those accessible sources. Interpretation of structures relies mainly on two aspects, positive alignments expressed by shaded topographic relief of ridges and negative features represented by the valley and river patterns (Chenrai, 2012;Meixner et al., 2018;Abed, 2013). Figure 1 shows the result of DEM interpretation for the currently studied area. In addition, the DEM analysis was then compiled with the results of the ground investigation within the study area. Given the interpreted DEM, several key areas have been identified for further structural observations, particularly those of Gilas, Saka, Malau Sarangan, Lubar, Rambang, Pisang, Sui, Liki and Meninting alignments (Figure 1). Figure 1. DEM analysis was used to identify regional alignments as the key areas for further structural description on outcrops.  (Berthé et al., 1979;Bouchez et al., 1983;Lister & Snoke, 1984;Simpson, 1985). Some of these techniques, before they can be applied in analysis, require oriented rock sampling data. Oriented Sampling is a rock sampling technique mainly focused on determining shear sense, whether it is ductile or brittle deformation. The results of this sample will be continued into the thin section process and can be used in the microstructural analysis. The stages of the sampling process include rock measurements, sample marking, and cutting slabs in petrographic analysis. The scanline method was used to measure orientation, length, aperture, spacing, and identify mineral fills in fractures along the given line (Priest & Hudson, 1981;Priest, 1993). The square system was undertaken mainly within the damage zones (Priest, 1993). Additionally, the technique was adopted particularly to identify the density and diagenetic relations among the internal structures recorded in rocks (Brodie et al., 2007;Sanderson & Nixon, 2015;Hooker et al., 2018). The construction and interpretation of the strain styles of The Garba sequence utilized a set of data gained from both linear scanline and square measurements as suggested by several workers (Mozley & Goodwin, 1995;Heynekamp et al., 1999;Rawling & Goodwin, 2006). Classification of fractures was based on the geometrical, kinematic, and mechanical parameters (Peacock et al., 2016). In addition, computer-aided analysis of structures in the present study has employed the stereonet V10 (Allmendinger et al., 2011;Cardozo & Allmendinger, 2013) and FaultKin8 programs (Allmendinger et al., 2011;Marrett & Allmendinger, 1990). These packages of software are available at http://www.geo.cornell.edu/geology/faculty/RWA/programs/.
Geochemical analysis of igneous rocks is very helpful in determining the magma evolution series in solving problems that occur in the Woyla volcanic arc. This analysis was carried out at the Geological Survey Central Laboratory using the XRF method.

Brief Overview of the Geology
Several studies have described the Garba complex as a basement high that consists predominantly of schist, phyllite, mélange, intrusive and extrusive rocks, and metasediments (de Coster, 1974;Barber & Crow, 2003;Barber et al., 2005;Sagita et al., 2008). These crystalline rocks constitute the Garba, Situlanglang, Insu, Tarap, and Granite Formations (Gafoer et al., 1994). The low-grade metamorphic rocks such as schist and phyllite were likely formed at shallower depths relative to the former subduction zone, while the tectonic mélange is thought to represent remnants of what were originally formed platform sediments that were subsequently mixed up tectonically in the paleo-subduction zone. This scenario is reliable with the published tectonic models (Barber et al., 2005) and (Hall, 2014), who postulated that the region was a site of the pre-Tertiary subducted plate. Allows for crustal thickening that can initiate collision-associated magmatism in the  (Handini et al., 2017).
Results of K/Ar dating from the sampled monzonite, gabbro, and granite reveal radiometric ages ranging from 117 -79 Ma (McCourt & Cobbing, 1993;Gafoer et al., 1994;McCourt et al., 1996). The radiolarian analysis from the outcropping chert of the Situlanglang ridge suggests that the sequence is Middle Triassic (Munasri et al., 2015). This interpretation is consistent with the earlier study (Barber & Crow, 2003). Regionally, the pre-tertiary sequences have been considered as a part of Woyla Group and West Sumatra basement (Barber et al., 2005;Van Hinsbergen et al., 2011;Metcalfe, 2013;Li, J. et al., 2018). According to (Metcalfe, 2011) the convergence of Woyla and West Sumatra crystals commenced during the Early Cretaceous, consistent with the kinematic plate reconstruction (Hall, 2014).
Little study on the outcrop-scale structures has been undertaken in the Garba block. Thus the area remains poorly understood structurally. Idarwati et al. (Idarwati et al., 2018) have reported their preliminary studies on vicinity structures. It is worth noting that the structure of the region is likely to be more complex than interpreted in the present work. Indeed, the previous studies commonly emphasized regional observations. The terrain is generally referred to as part of the present Woyla Group. It is apparent from the published reports that interpretations on the origin and time of migration of the proto Woyla Group into its present location appear distinctive. In the Late Jurrasic-Early Cretaceous, the region was an intra-oceanic arc and or accretionary complex that became sutured to Sumatra (Wajzer et al., 1991;Barber, 2000). The more recent works reported that the Woyla arc collided and subducted underneath the western Sumatra segment in the Middle Cretaceous time, creating a new magmatic arc that yielded the Garba succession (Torsvik et al., 2012;Advokaat et al., 2018). This scenario seems consistent with the earlier studies (Cameron et al., 1980), who suggested that the western portion of the Woyla arc overlies the Sikuleh continental fragment. However, Barber and Crow (Barber & Crow, 2003) stated that the microcontinent is part of the Woyla block.

Tectonics
The structure that developed in the Paleozoic is dominated by parasitic folds with shortening from 7.74 to 61.45 cm. That indicates that West Sumatra has been hit by a contraction ratio of 0.57% -0.84%, including Middle Cretaceous Woyla Arc accretion, Paleogene crust extension, to Neogene compression (Hall, 2014;Advokaat et al., 2018). Based on this structure, it can be interpreted that    In addition to these events, the Woyla Arc was formed during the Late-Triassic, which is part of the intra-oceanic arc. This block is in the SW-Sundaland margin in the Tethys Cenozoic, along with the Kohistan-Ladakh Arc, formed during the Late-Triassic (Metcalfe, 2011(Metcalfe, , 2013.

Permian-Triassic Period
The chert formed in Situlalang is evidence of the discovery of Triassic radiolaria (Munasri et al., 2015). From petrography, we found chert with a non-clastic and amorphous texture containing microcrystalline in the form of radiolarians surrounded by reddish-brown oxide minerals.

Early Jurassic-Cretaceous Period
In this period, the Ceno-Tethys split occurred during the Late-Jurassic, due to the spreading of the intra-oceanic arc and the movement of the transform fault from Gondwana (Metcalfe, 2017). This phase is correlated with the Woyla arc fragment in the Oceanic lithosphere that separates from Eurasia (Margin Sundaland) and produces the Ngalau Ocean at 130 Ma (Barber et al., 2005;Torsvik et al., 2012;Advokaat et al., 2018). The Woyla Arc is an intra-oceanic arc fragment, along with the Kohistan-Ladakh Arc which was formed during the Late-Triassic (Metcalfe, 2011(Metcalfe, , 2013 Based on geochemical analysis using XRF (Figure 3; Figure 4) from the samples IF2, IF3, and G17, it was known that these samples had a SiO 2 value of ± 65%. The Al 2 O 3 is presence quite high, this is manifested in rocks with many muscovite minerals appearing. The K 2 O(%) in the three samples showed < 3.2% with K 2 O values ± 4.5%., in samples IF2 and G17. However, in the IF3 sample  shear strain. The interpretation is consistent with the observation that the boudin structure appears to have changed in geometry from flattening in the SE to shear band in the NW ( Figure 5). According to (Goscombe et al., 2004) such structural features are classified as symmetric types (RHS).

Early Jurassic-Cretaceous Period
This period was marked by merging the Woyla Block fragments with SW Sundaland (West Burma, West Sumatra, & Sibumasu) (Metcalfe, 2017). This phase resulted from the subduction that occurred during the Middle Cretaceous (95 Ma) and formed a new Magmatic arc (one segment is interpreted as Garba Complex) (Torsvik et al., 2012;Advokaat et al., 2018). Refer to (Handini, 2017) in this period also associated with magmatism in 91.3 ± 1.9 million years old.
This Petrographic analysis in the Liki, Pressa, Sui, and Kiti areas shows that granite with anhedral to subhedral crystal form, with a crystal size of 0.1 -5 mm, is supported by dominant orthoclase minerals, quartz, plagioclase, K-feldspar, sericite, biotite, calcite, chlorite, muscovite, opaque minerals, hornblende and small amounts of talc in some locations. That is confirmed by XRF analysis, as many as two samples analyzed, namely Liki G17 and Pisang IF2 on granite rocks, indicating that magmatism in the continental arc occurred due to plate collisions (after subduction). The magmatism affinity series at these two locations shows the type of Hi-K Calc-Alkaline series (Peccerillo & Taylor, 1976).
Along the Woyla Arc and SW-Sundaland contact boundaries, several volcanic paths and dextral strike-slip faults (Sumatra Fault Systems) are produced.

Paleogene Extension Period
The Paleogene period is characterized by the extension and inversion of the

Late Neogene Orogeny Period to Extended Pleistocene
This period is marked by the Uplift of the Orogeny Row, resulting from the compressional development that developed during the Neogene period (Pulonggono et al., 1992). As a result, reactivation of normal faults previously developed during the Paleogene, one of the products is the Meninting fault. Sumatra (Barber et al., 2005). The process is interpreted to come from the effect of increasing magmatism activity. Thus, this implies that plutonic granite, which was previously still on the surface, was then exposed through the Sumatra Fault Zone fracture zone.
• This extension phase produces a series of electric faults divided into two parts, west, and east. First, the western part is composed of the Saka, Gilas, and Malau blocks. Meanwhile, the eastern blocks are Rambang and Lubar.
The block is affiliated with the Woyla Group (continental arc, magmatic arc, and oceanic accretionary arc) with West Sumatra. The orientation of these blocks is relatively NW-SE, and the fault dip towards the granite detachment tends to become shallower (shallow dip). • The Sumatra Fault System (SFS) development is NW-SE oriented and has implications for the Pluton Granite block pattern to become Transtensial.
The main control is the dextral strike-slip fault, which is correlated with the Lematang Fault in the direction of WNW-ESE and the Kikim Fault with the orientation of N-S (Pulonggono et al., 1992).

Conclusion
The present study area is composed of heterogeneous rocks, predominantly igneous and metamorphic successions. Based on XRF data shows two different igneous rock environments in the Woyla that indicate different formation times, namely tholeiitic to calc-alkaline in the Jurassic-Early Cretaceous and hi-k calcalkaline series in the Late Cretaceous. The region is very complex structurally as it has been subjected to poly-phased deformation, resulting in blocky and rough exposures. The prominent fractures that have been recognized in outcrops include those of Gilas and Saka, Malau Sarangan, Lubar, Rambang, Pisang, Sui, Liki, and Meninting faults. Observations on the outcropping structures reveal that the area might have been subjected to at least three episodes of tectonic events during the Tertiary. In the Paleogene, the terrain was dominated by an extensional regime that might have been responsible for developing the NW-SE striking alignments and the formation of sedimentary basins. In the Late Neo-Idarwati et al. Journal of Geoscience and Environment Protection gene, the Barisan orogeny commenced, and uplift of the Pre-Tertiary sequence and the inversion of the adjacent Paleogene South Sumatra basin took place. As the orogenic compression ceased in Pleistocene, the crustal extension occurred, and a number of NNW-SSE-directed tensional fracturing developed within the Garba block. Eventually, the Pleistocene deep and extensive erosional denudation exhumed and shaped the recent landforms. This study obtained a highresolution structure compared to previous studies that have been carried out.
The microstructure and evolutionary geochemical data in Garba complex tectonic studies are very helpful for future research.